Compatibility Fits Delonghi ECP3420, ECP31.21, ECP35.31 and most 51 mm twoear Delonghi espresso machines. Two Spouts Twospout design lets you brew two single espresso shots at the same time with minimal coffee residue between shots. Capacity Includes a 2cup filter basket that can hold up to 16 grams of coffee powder. Material and Build Bottomless Portafilter crafted from 304 foodgrade stainless steel for safety, durability, and easy cleaning. The design is ecofriendly and nontoxic. Performance and Design Bottomless construction provides clear visibility of the extraction, helping you dial in grind size, dose, and tamping for better quality shots. Use Scenarios Home use: quickly prepare two espresso shots for mornings or after meals when entertaining guests. Small gatherings or parties: serve two guests at once without delays. Practice and calibration: observe flow and channeling to improve technique and consistency.