The main purpose is to prevent the impact of high-pressure hot water on the coffee powder, causing the surface of the powder to crack.The cracked powder will produce a lot of "floating" subdivisions, which is easy to over-extract and produce miscellaneous flavors, and it will stick to the upper water separator after extraction.
The thicker the thickness, the less powder will be loaded, depending on the powder basket
Notice : 53.5 mm can use for 54MM Portafilter
58.5 mm can use for 58MM Portafilter
Made of stainless steel 316