NEOUZA 51mm Replacement Two Ear Handle,Removable Stainless Steel Cup Filter Basket The bottomless portafilter differs significantly from the original bottomed portafilter. Not everyone could make it work easily!!! The primary reason to invest in a bottomless portafilter is its value as a learning tool. It gives you a full, unobstructed view of the transformation of water and ground coffee into velvety, delicious espresso. By exposing the extraction process to you, it allows you to make adjustments with less guesswork. Suitable Model- ECP31.21,ECP33.21,ECP35.31,BCO430, BCO432, EC155, EC155M, ECO310, EC330, EC330S, EC702, ECP3420, ECP3630, ECP3220, ECP3220W, ECP3220R, ECP3120 and other coffee machine.