This multi-tube cartridge filter housing is made of 18 gauge 316 stainless steel. Housings are available to accommodate 10, 20 30 or 40 inch long code F filters (double open end). There is a 1/2" NPT drain plug and a 1/4" NPT vent at the top of the housing. A swing bolt closure allows for quick disassembly for cleaning or service. This cartridge filter housing is ideal for a wide variety of high flow applications that require an economical, high quality housing.