An espresso spare parts checklist is a shelf plan, not a shopping spree. Keep on hand the items that stop a home machine or wreck the next week of shots when they fail—group gasket, shower screen, a few steam-path seals, water-filter cartridges, and the chemistry you already use on a calendar. Put “nice-to-have” tools (a better tamper, a WDT tool, a second portafilter) in a different mental bin so they do not crowd out the parts that actually wear. Size is a gate, not a style choice: a 54 mm group and a 58 mm group do not share baskets, screens, or gaskets. This Kairos Coffee page tells you what to stock by priority, what is a consumable versus a wear part versus a tool, and what you should not buy “just in case.”
Use it as the stocking list under the coffee machine ownership guide. Name the hardware first with the espresso machine components guide. Care cadence lives in espresso machine maintenance. When a part is due, jump to the swap or ID article—do not treat this page as a gasket tutorial or a steam-tip encyclopedia. Browse machines after you know which size family you own: espresso machines.
Quick answer:
- Must-have: one matching group gasket, one shower screen (if yours is user-replaceable), steam-tip O-rings, approved descaler, backflush detergent if the group backflushes, and the water-filter cartridges your setup actually uses
- Should-have: a spare basket of the same diameter and type, a spare steam tip or panarello sleeve if you steam daily, a blind basket if it is not already in the box
- Nice-to-have: extra portafilter, puck screen, better tamper, WDT tool—shot-quality tools, not machine-saving spares
- Size rule: measure the group / basket family (often 54 mm or 58 mm) before you order anything that touches the puck or the seal
- Do not stock: pumps, boilers, or a “spare solenoid” because a wet puck appeared once—diagnose first
Who This Espresso Spare Parts Checklist Is For (and Who Should Skip It)
Who it’s for: home owners of semi-automatic and prosumer pump machines who pull shots with a portafilter and want a small drawer kit before the gasket flattens on a Sunday. Also for anyone who inherited a used machine, just finished the first-year learning curve, or keeps panic-ordering a “universal 58 mm kit” that does not fit. Useful if you already clean on a calendar but have never labeled which bottles are consumables and which rubber rings are wear parts. Milk-drink households should add steam-path seals to the same list—not a second mystery box on another shelf.
Who should skip: capsule-only kitchens—the brew chamber is in the pod, not a user gasket stack. Super-automatic bean-to-cup owners with a removable plastic brew group need brew-unit seals, milk tubes, and brand cartridges, not a portafilter gasket kit. Café multi-group bars under a service contract should follow the shop BOM, not a home drawer. Skip this page if you only need the pick-and-pry sequence for a dead gasket, or only need to name the screen versus the rubber—those jobs live on the dedicated parts pages. Skip it if water is pooling under the chassis or the machine smells of burnt electronics; that is service, not stocking.
Takeaway: Stay here when the question is “what belongs on the shelf before something fails?” Leave when the question is “how do I replace this gasket?” or “what is every component called?”
Consumables vs Wear Parts vs Tools
Most “espresso machine spare parts” carts fail because they mix three jobs. A descaler bottle is not a spare part. A tamper is not a spare part. A group gasket is a spare part. If you treat them as one shopping list, you either overbuy gadgets or run out of the one ring that stops leaks.
| Bucket | What it is | How it leaves the shelf | Stock logic |
|---|---|---|---|
| Consumables | Chemistry and filters you use up on a schedule: descaler, coffee-oil / backflush detergent, milk cleaner if you have a carafe path, water-filter cartridges, and (if you use them) water-treatment pouches | Calendar and cup count, not a breakdown | Keep one full cycle on the shelf plus the open bottle in use. Reorder when you crack the spare, not when the machine beeps empty |
| Wear parts | Hardware that compresses, cooks, clogs, or loses shape: group gasket, shower screen, steam-tip O-rings, panarello sleeve, basket spring, sometimes the steam tip itself | Heat, oils, milk film, and mechanical lock-in—not “one year because a blog said so” | Keep one matching spare of each high-failure item. Do not keep three gaskets of unknown profile “because they were cheap” |
| Tools | Things that help you work or improve the shot: group brush, screwdriver or hex key the machine actually uses, hole pin for the steam tip, optional tamper, optional WDT tool, scale, knock box | They do not get consumed by the boiler. They wear slowly or not at all | Buy the hygiene tools. Treat tampers and WDT as workflow upgrades, not emergency stock |
Consumable chemistry is a different decision from “which gasket.” Oils versus minerals versus milk protein is explained in coffee oil tablets vs descaler—this checklist only tells you to keep the correct bottle on the shelf, not which residue you have today. Filter cartridges belong with consumables even though they look like hardware; the setup choice (pitcher, tank stick, inline) lives in the coffee machine water filter guide.
Wear parts need a match, not a vibe. A shower screen and a group gasket sit in the same few centimeters of group head, but they fail for different reasons and they are not interchangeable with “any 58 mm kit.” Identification and clean-versus-replace cues are in the espresso shower screen and gasket guide. The actual gasket swap is espresso group head gasket replacement. Milk-path wear is named in the steam wand parts guide.
Tools are optional until they are not. A nylon group brush and a steam-tip pin prevent the wear parts from dying early. A precision tamper and a WDT tool change puck prep. They do not unstick a cooked gasket on a Monday morning. If budget is tight, buy the brush and the pin first.
Takeaway: Label the drawer in three rows—chemistry, rubber/metal that fails, tools—so a restock trip never substitutes a gadget for a gasket.
Priority Tiers: Must-Have vs Should-Have vs Nice-to-Have
Priority is about downtime and damage, not enthusiasm. A must-have item is one that, if it fails tonight, either leaks brew water, ruins seal feel, blocks a required clean, or leaves you with no safe water path. A nice-to-have item makes better espresso when everything else already works.
| Tier | Stock these | Typical home quantity | Skip if |
|---|---|---|---|
| Must-have (shelf, always) | Matching group gasket; user-replaceable shower screen; steam-tip O-rings (two); manufacturer-approved descaler; backflush detergent if your group is designed to backflush; water-filter cartridges you actually use; group brush; steam-tip pin thinner than the holes | One spare of each wear item; one extra full clean/descale/filter cycle of consumables | You never steam (drop the steam O-rings). Your screen is not owner-serviceable (do not pry it “to have a spare”) |
| Should-have (same drawer) | Spare basket, same diameter and same pressurized or non-pressurized type; blind / backflush disk if not in the box; spare steam tip or panarello sleeve if you steam most days; portafilter basket spring if yours is a loose clip-in spring | One each | You drink espresso only, never milk, and already have a healthy spare basket in the original kit |
| Nice-to-have (optional, second bin) | Second portafilter (spouted or bottomless); puck screen; calibrated tamper; WDT tool; extra single basket; silicone gasket “upgrade” only after you confirm profile; spare shower-screen screw/washer if it is a separate piece | Zero or one—buy when the daily ritual is already stable | You are still learning lock-in and grind. Gadgets will not diagnose a worn seal |
| Not a home spare | Vibration pump, boiler, three-way solenoid, OPV as a “kit,” entire group head, random “universal” gasket packs without a measured match | Zero on the kitchen shelf | — |
Must-have: the machine-saving row
The group gasket is the first wear part most home semi-autos actually need. When it flattens or cracks, you get side spray, a mushy lock, or bitter drips after the shot. Shipping a correctly matched gasket often takes days; that is why it sits on the shelf before it fails. You do not need the replacement SOP on this page—you need one spare that matches the groove (flat versus conical, thickness, and group diameter family). Keep it in a labeled bag with the machine model written on it, not loose in a junk drawer where heat and oil can distort the rubber.
The shower screen is the second common wear item on screw-in or clip-in groups. Oils and fines clog holes; heat can warp a thin screen. A spare screen is cheap insurance if yours is designed to come off with a center screw or a known clip. If the screen is captive or the manufacturer warns against owner removal, do not stock a random disc “for later.” Wrong hole pattern and wrong diameter change water distribution even when the rubber seal is perfect.
Steam-tip O-rings are the milk-path equivalent of a group gasket: small, cheap, and the reason a tip weeps steam at the thread. Two rings is enough. You rarely need a spare wand arm. If the machine uses a panarello sleeve, the sleeve itself is a should-have, not a must-have, unless it is already yellowed or cracked—then it moves up a tier because you cannot foam until it is replaced.
Consumables in the must-have row are the ones your maintenance calendar already names. If the machine backflushes, detergent belongs next to the blind basket. If it does not backflush, do not buy commercial backflush powder “because espresso.” Descaler belongs on the shelf only in a formula the manufacturer allows for that boiler or thermoblock; vinegar is not a spare part. Filter cartridges belong here if you already chose a filter path. Empty-filter “I’ll buy one when the light comes on” is how hard water writes scale into a heater while you wait for shipping.
Should-have: one extra brew or milk path piece
A spare basket of the same size family and the same type (pressurized versus non-pressurized) saves a weekend when the everyday basket dings, the spring pops, or you want to soak the dirty one without skipping coffee. Do not stock a 58 mm basket for a 54 mm portafilter as a “upgrade.” Diameter is compatibility, not quality. The comparison of those two families is in 58mm vs 54mm portafilter—use that page before you add a second basket to the cart.
A spare steam tip is worth it if you steam daily and the current tip has fine holes that clog with milk film. One matching tip plus two O-rings is a complete milk-path mini-kit. A panarello machine wants the sleeve (or the brand’s frother-parts kit) more than a fancy multi-hole pro tip that will not thread on.
Nice-to-have: tools that are not spares
A tamper is a tool. Many machines include a plastic disc that works. A heavier, correctly sized tamper can improve puck prep; it does not belong in the must-have spare row. Buy it when shots are already sealing and you are chasing consistency—not when the group is leaking.
A WDT (Weiss Distribution Technique) tool is the same story: optional puck-prep, not a wear part. It does not substitute for a clogged screen or a cooked gasket. If you buy one, store it with the tamper, not with descaler.
A second portafilter, a bottomless portafilter, and a puck screen are workflow and diagnostics upgrades. They are legitimate purchases. They are not why this checklist exists. If the budget is one box, fill the must-have row first.
Takeaway: Must-have stops the machine or the required clean. Should-have keeps the morning ritual when one small piece is in the sink. Nice-to-have changes the shot, not the ability to make one.
Size Compatibility: 54 mm vs 58 mm (and Why Kits Fail)
The most expensive mistake on an espresso spare parts checklist is buying by a number you saw in a forum, not by the group you own. “58 mm” is a family, not a magic quality grade. Many home machines—especially a large set of consumer Sage / Breville-style groups—use a 54 mm portafilter and basket family. Many prosumer and E61-style groups use 58 mm. Other machines use 51 mm, 53 mm, or brand-specific faces. If the basket does not drop into the portafilter and sit flush, stop. Do not force it.
Size is a stack, not a single measurement:
- Portafilter body and ears: must lock into your group. A 58 mm portafilter will not lock into a 54 mm group, and the reverse is also true.
- Basket: must match the portafilter well. A 58 mm basket in a 54 mm portafilter either will not seat or will sit high and destroy the seal.
- Group gasket: must match the groove diameter and profile (flat, conical, stepped). “8 mm thick 58 mm gasket” is still wrong if your group wants a conical 54 mm seal.
- Shower screen: must match the recess and the retaining screw or clip. Diameter and hole layout both matter.
- Tamper and puck screen: follow the basket inner diameter, which is related to but not identical to the “54 / 58” marketing label. Measure the basket you actually brew with.
Do not invent or hunt “OEM part numbers” from memory. Order from the machine’s model page, a parts diagram for that exact model, or a seller who asks for the model and shows the gasket profile. If a listing says “fits most 58 mm machines,” treat it as a guess until you compare photos of the groove and the screen screw. Mixing families causes leaks that look like a “bad gasket” even when the rubber is new.
If you are choosing a machine or a second portafilter and the 54-versus-58 decision is still open, that is a compatibility article, not a spare-parts article: read 58mm vs 54mm portafilter, then come back and stock only the family you own. One household with two machines in two sizes needs two labeled kits. One mixed bag is how a 54 mm gasket gets installed in a 58 mm groove “because it was in the drawer.”
Takeaway: Write the size family on the bag. Measure once. Never stock a “universal” kit that disagrees with the portafilter that already locks into your group.
The Must-Have Shelf, Item by Item
This section is the stocking brief for each must-have line. It is not a repair manual. When a row says “replace,” open the linked how-to; when it says “identify,” open the ID guide.
Group head gasket (wear part)
Stock one spare that matches your group. Typical home replacement windows run roughly every 6–18 months depending on shot volume, heat, and whether oils bake onto the rubber—sooner for several drinks a day, later for weekend-only use. Flattened, cracked, hard, or “won’t bite at the usual lock angle” means the spare should already be in the house. Cleaning slows wear; it does not reverse compression set. Procedure: espresso group head gasket replacement. Identification versus the screen: shower screen and gasket guide.
Do not buy three random thicknesses. Wrong geometry leaks with brand-new rubber. Silicone versus rubber is a material choice after you know the profile, not a reason to skip matching the groove.
Shower screen (wear part)
Stock one spare if the screen is owner-removable. Replace when it is warped, corroded, or still clogged after a proper clean. A brown, oily screen is often a clean job, not a parts job—keep the spare for when cleaning fails. Do not drill holes larger. Do not assume every “58 mm screen” shares your center-screw thread.
Steam-tip O-rings and, if needed, the tip (wear part)
Stock two O-rings that fit the tip you already have. Add a spare tip only if you steam often and the current tip is a fine-hole design that clogs. Do not stock a wand arm. Do not drill holes. Parts names and clean-versus-replace: steam wand parts guide.
Descaler (consumable)
Stock the product the manufacturer allows for your boiler or thermoblock. Keep enough for one full descale plus rinse, plus a sealed spare bottle or packet if you descale on a short interval (hard water, daily use). This checklist does not pick a brand and does not license vinegar. Wrong acid on the wrong machine is not “being prepared.”
Backflush detergent or coffee-oil cleaner (consumable)
If the group is designed to backflush with a blind basket, stock espresso-safe detergent and know it is an oils job, not a minerals job. If you own a super-automatic instead of a portafilter machine, the analog is brew-path tablets—still a consumable, still not a gasket. Chemistry split: coffee oil tablets vs descaler. Do not backflush a machine that the manual says not to backflush.
Water-filter cartridges (consumable that looks like a part)
If you use a tank stick, pitcher cartridge, or inline cartridge, the spare lives on this shelf. A filter past its capacity is worse than a simpler jug you actually replace. Architecture and when to filter versus descale: coffee machine water filter guide. Do not stock three incompatible cartridge formats “in case you change systems.”
Hygiene tools that belong next to must-have parts
A group brush and a steam-tip pin are tools, but they belong in the same pouch as the gasket because they prevent the wear parts from dying early. The pin must be thinner than the steam holes. A toothbrush from the bathroom is a poor substitute (bristle shed, wrong chemicals). A dedicated brush is a few dollars; treat it as must-have hygiene, not a gadget.
Takeaway: The must-have shelf is one matched gasket, one matched screen if yours comes off, two steam O-rings, the chemistry you already scheduled, the filter you already chose, and the two tools that keep those parts alive.
Should-Have and Nice-to-Have: Where Tools Sit
Once the must-have row is filled, extra brew hardware is about convenience. A spare basket lets you soak without skipping a morning. Match diameter and type. A pressurized basket is not a spare for a non-pressurized workflow; it is a different tool for a different grind. If the box already included a single and a double, you may only need a second double of the same type.
A blind basket (backflush disk) is should-have if the machine backflushes and the disk is easy to lose. It is not optional chemistry—it is the hardware that makes the detergent job possible. If your machine uses a pressurized basket as a “sort of blind,” follow the manual; do not invent a backflush the group was not designed for.
Nice-to-have tools deserve an honest sentence each:
- Tamper: optional upgrade. Size to the basket inner diameter, not to a forum’s favorite millimeter label. Store with prep tools.
- WDT tool: optional distribution. Useful on fluffy grinds; useless against a leaking gasket or a scaled thermoblock.
- Puck screen: optional. Can keep the shower screen cleaner; it is not a spare shower screen.
- Second portafilter: optional. Handy for milk drinks versus straight espresso, or for a bottomless diagnostic. Still must match the group size family.
- Scale and kettle: brew tools, not espresso-machine spares. Keep them off this list so the drawer stays honest.
If you only buy one optional item after the must-have kit, make it the spare basket or the spare steam tip—the piece that matches how you actually drink. A WDT tool is a poor first upgrade for a household that still has no gasket on the shelf.
Takeaway: Tools can wait. A second basket and a milk-path tip usually should not wait if you brew daily.
What Not to Stock (and the Solenoid Exception)
Home drawers should not look like a technician’s van. Pumps, heating elements, and boilers are not “spares you keep next to the coffee.” They need diagnosis, correct fittings, and often warranty-safe service. Buying a vibration pump because the machine gurgled once is how people collect parts for the wrong failure.
The three-way solenoid is the classic false spare. A wet puck, a drip from the group after the shot, or a tray that fills faster than usual can be a solenoid symptom—or a dirty group, a missing three-way on a cheaper thermoblock, or a grind so fine the puck stays soggy. Stocking a solenoid “to be safe” without symptoms is wasted money and a parts-match headache. If those symptoms showed up, read espresso 3-way solenoid symptoms first. Order the valve only after the symptom map says the valve, and only as a model-matched part—not as a generic “espresso solenoid” from a mixed bin.
Also leave off the shelf:
- OPV springs and “9 bar kits” unless you already know your machine has an owner-adjustable OPV and you have a reason to service it
- Random E61 service kits for a machine that is not an E61
- Commercial group gaskets sold by café thickness with no photo of your groove
- A second water tank, drip tray, or steam wand because they were on a parts site homepage
- Vinegar, dishwasher tablets, or bathroom descaler as “backup chemistry”
The components atlas still matters so you do not mis-name what you refuse to stock: espresso machine components guide. Knowing the pump exists is not the same as keeping a pump in the pantry.
Takeaway: Diagnose expensive internals. Stock cheap, matching wear items and the consumables your calendar already burns.
How to Order Without Guessing Part Numbers
You do not need a memorized OEM code. You need a match. Use this order:
- Write the exact machine model from the data plate or the underside label, including a sub-model if there is one.
- Write the size family you already verified (54 mm, 58 mm, or other) from the portafilter / basket that currently locks and brews without a fight.
- Photograph the part on the machine (gasket in the groove, screen with screw, steam tip face) before you remove it, if it is safe to do so with the machine cool.
- Match profile, not just millimeters: flat versus conical gasket, screw-in versus clip screen, panarello versus bare tip.
- Buy from a listing that shows that profile or from the manufacturer’s parts diagram for that model. If the seller cannot tell 54 from 58, leave.
This article will not invent brand part numbers. Listings go stale; clones exist; the same millimeter label hides different grooves. A correct photo of your gasket next to a ruler is more useful than a code copied from a stranger’s cart.
When the spare arrives, dry-fit before you need it: gasket into the cool group (or compare to the old ring on the bench), screen against the recess, O-ring onto the tip. If it is wrong, you still have coffee today. That is the whole point of stocking ahead.
Takeaway: Model + size family + profile photo beats a generic “espresso gasket” search every time.
Build the Kit by How You Actually Brew
Not every home needs the same drawer. Volume and milk change the should-have row. The must-have row stays short in every case.
| Household pattern | Must-have (same core) | Add | Leave off |
|---|---|---|---|
| Weekend espresso, little or no milk, 54 or 58 mm semi-auto | Gasket, screen if removable, descaler, filter cartridges if used, brush | One spare basket | Steam-tip collection, WDT, second portafilter until you care |
| Daily shots, milk most mornings | Core plus two steam O-rings, tip pin, milk-safe wand hygiene | Spare steam tip or panarello sleeve; spare basket | A “pro” multi-hole tip that does not fit your wand thread |
| Hard tap water, daily use | Core plus extra filter cycle and descaler on a shorter interval | Whatever filter path you already chose—not a second mystery system | Skipping filters because “I have descaler in the drawer” |
| Two machines, two size families | Two labeled bags, never one mixed kit | Duplicate consumables only if chemistry is shared and allowed on both | One “universal 58 mm” bag for both groups |
| Super-automatic in the same kitchen | That machine’s brew-group and milk-tube path is a different list | Brand tablets, milk cleaner, tank filter if required | Portafilter gaskets “because it’s still espresso” |
Cadence still belongs to maintenance, not to this page. Typical home ranges—wipe the group daily, backflush on a weekly-to-biweekly band if the machine is built for it, descale on water hardness rather than on a lucky calendar, inspect the gasket monthly by eye—are the job of espresso machine maintenance. This checklist only answers whether the replacement item is already in the house when that calendar says “replace,” not “clean.”
Takeaway: Copy the row that matches your mornings. Do not copy a café BOM or a YouTuber’s full E61 service kit.
Where to Store It (So You Can Find It)
Heat, coffee oil, and a wet drip tray are bad neighbors for spare rubber. Keep the kit in a cool, dry drawer or a lidded box away from the machine’s side panel. Put each wear part in a small bag labeled with: machine model, size family (54 / 58 / other), part name, and the month you bought it. Consumables stay upright and sealed. Do not store descaler in an unmarked cup.
A one-page card in the lid beats a memory: must-have list, date of last gasket change, date of last descale, filter change date. That card is not a second maintenance guide. It is the index that sends you to the right bottle.
If you share the machine, the kit location is part of ownership, not a secret. The person who notices side spray should not have to hunt a gasket in a garage toolbox. The ownership hub’s point still holds: rituals fail when nobody knows where the spare lives—see coffee machine ownership guide.
Takeaway: One labeled box. Model and millimeters on the bag. Chemistry upright. Rubber away from heat.
Common Mistakes on an Espresso Machine Spare Parts Shelf
- Buying 58 mm because “that’s real espresso.” If the machine is a 54 mm group, 58 mm parts do not make it a café machine. They make leaks.
- Stocking a tamper and skipping the gasket. Prep tools do not seal 9 bar.
- One mixed bag for two machines. Label or lose.
- Treating descaler as a gasket substitute. Minerals and rubber are different jobs. Chemistry: coffee oil tablets vs descaler.
- Ordering a solenoid because the puck was wet. Open the symptoms page first: espresso 3-way solenoid symptoms.
- Prying a non-serviceable screen to “have a spare.” You can wreck the group for a part you cannot install.
- Leaving the spare gasket on top of the machine. Heat cooks the spare the same way it cooks the installed one, just slower.
- Universal kits with no profile photo. Millimeters without groove shape are a guess.
- Backflush powder in a machine that must not be backflushed. Read the manual; this checklist will not override it.
- Filter cartridges from a different ecosystem. A pitcher cartridge is not a spare for a brand tank stick unless the manufacturer says it is.
Takeaway: Most spare-parts grief is a size mismatch or a category mix-up, not a missing exotic valve.
Who Should Skip a Full Kit (and What They Keep Anyway)
If the machine is still under a warranty that forbids owner group work, stock consumables and hygiene tools, and leave gaskets until the manufacturer path is clear. If you only use the machine as a guest curiosity a few times a year, a gasket on the shelf still makes sense—rubber fails in storage on the machine too—but you can skip spare baskets and steam tips. If you are about to replace the machine, do not build a prosumer kit for a unit that is leaving the kitchen; spend the money on the next group’s correct size family instead. Shop the next machine by the group you are willing to stock parts for: espresso machines.
Takeaway: A small must-have kit is still rational on a light-use machine. A large nice-to-have kit is not.
FAQ: Espresso Spare Parts Checklist
What belongs on a home espresso spare parts checklist first?
First: one matching group gasket, a user-replaceable shower screen if your group uses one, two steam-tip O-rings if you steam, the descaler and (if applicable) backflush detergent your manual allows, and the water-filter cartridges you already committed to. Those items cover the failures that stop shots or skip required cleaning. Add a spare basket and a spare steam tip when you brew or steam daily. Put tampers and WDT tools on a separate, optional list.
Do I need different espresso machine spare parts for 54 mm and 58 mm?
Yes. Treat 54 mm and 58 mm as different ecosystems. Portafilters, baskets, many gaskets, shower screens, and tampers do not swap across that split. Confirm the family from the portafilter that already locks into your group, then stock only that family. Details and edge cases: 58mm vs 54mm portafilter.
Is a tamper or WDT tool part of espresso machine spare parts?
No. They are tools. They can improve puck prep. They do not replace a worn gasket, a clogged screen, or an empty descaler bottle. Buy them after the must-have wear parts and consumables are on the shelf.
Should I keep a spare three-way solenoid at home?
Not as a default. A wet puck or a group that weeps after the shot needs a symptom check before a parts order. Use espresso 3-way solenoid symptoms. Only order a model-matched valve after that map points at the valve—not because a kit list on the internet included one.
How many group gaskets should I stock?
One correct spare is enough for almost every home. Two identical, confirmed-profile gaskets can make sense if you pull many drinks a day and shipping is slow where you live. Do not stock a handful of mixed thicknesses “to try.” Wrong profile wastes the spare and the morning.
Next Step
Write the machine model and size family on a bag today. Put one matching gasket and (if owner-serviceable) one matching shower screen in it, plus the consumables your espresso machine maintenance calendar already names. If you cannot yet name the screen versus the rubber, open the shower screen and gasket guide before you order. If the gasket is already leaking, skip shopping extras and go straight to group head gasket replacement. For the rest of the ownership map—unbox, specs, daily use—return to the coffee machine ownership guide. When you eventually change machines, pick a group size you are willing to stock parts for and start from the espresso machines collection.