Bottomless Portafilters 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 bottomless portafilters - they will not fit the 51mm group.
- Upgrade priority
- Optional - a later refinement, not a first purchase.
- 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.
+23 more wrong-size or wrong-ecosystem items.
Before buying bottomless portafilters
Does any 51mm bottomless portafilter 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 bottomless portafilter 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.
Will a bottomless portafilter fix channeling?
No. It exposes the underside of the basket so uneven flow is easier to see; grind, distribution, dose, tamp, and basket condition still determine the result.
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.