Gaskets for the De'Longhi ECP3420
- Size matches the 51mm De'Longhi ECP3420 group.
- Listing claims compatibility with DeLonghi machines.
- This is a 51mm 2-ear machine; the widely sold 58mm and 54mm accessories are incompatible. Match everything to the 51mm De'Longhi ear pattern.
- The delonghi-51 ear family is shared across models like the EC155, EC260 and the ECP31/33/35 Stilosa line, so listings that name those models generally fit the ECP3420 too, but confirm the 2-ear 51mm spec before buying.
- This machine has no 3-way solenoid valve, so backflush cleaning discs and blind baskets do not apply here; they are wasted on the ECP3420.
- Aftermarket bottomless portafilters and precision baskets exist and mount to the 51mm ears, but fit and finish vary by seller; we analyzed manufacturer and retailer specs rather than bench-testing individual units.
- What size to buy
- Buy 51mm for the De'Longhi ECP3420.
- What to avoid
- Avoid 54mm and 58mm gaskets - they will not fit the 51mm group.
- If you own another machine
- Own a Breville Bambino? Use the 54mm page instead - these 51mm parts will not fit it.
Affiliate disclosure: this page contains affiliate links. If you buy through them we may earn a commission at no extra cost to you. We have not physically tested these products; all compatibility analysis is based on manufacturer specifications and publicly available listing data. "Seller-claimed" means a marketplace listing asserts the fit; it is not manufacturer-confirmed. Verify size against your machine before purchase.
Recommended matches
Check carefully
Possible fits we couldn't fully verify - confirm size and compatibility on the listing before buying.
Won't fit / not recommended
Listed for reference only - these are the wrong size or for a different machine, so we don't recommend them for this machine.
Before buying gaskets
Does any 51mm gasket fit the De'Longhi ECP3420?
No. The nominal size is only the first check. Model-specific locking geometry, basket depth, mounting pattern, or clearance may also matter. This is a 51mm 2-ear machine; the widely sold 58mm and 54mm accessories are incompatible. Match everything to the 51mm De'Longhi ear pattern.
Is a gasket the first upgrade to buy?
Not automatically. The De'Longhi ECP3420's stored upgrade order starts with tamper; fix grinder, basket, dose, or maintenance issues before adding optional tools.
Affiliate disclosure: this page contains affiliate links. If you buy through them we may earn a commission at no extra cost to you. We have not physically tested these products; all compatibility analysis is based on manufacturer specifications and publicly available listing data. "Seller-claimed" means a marketplace listing asserts the fit; it is not manufacturer-confirmed. Verify size against your machine before purchase.