... needs 2) Good quality 3)Best service Sintered copper porous filterHENGKO Powder Metallurgy Co., Ltd.Sintered filter cartridge: ... steel powder metallurgy filters, sintered metal powder filters, sintered porous filter, five sintered stainless steel mesh filter, muffler BSL, ... stainless steel sintered ( filter, cartridge, filter tube, filter, filter), porous sintered filter material.www.hengko.cn