Pentair Pentek Big Blue filter housing with drain offers the versatility to meet all of your large-capacity filtration needs, including high-flow and heavy-sediment applications. The extra-large housing allows for greater cartridge capacity, reducing the number of vessels required for high flow rate applications. Sumps are available in both 10" and 20" lengths. The High Flow Polypropylene (HFPP) Cap is available in 3/4", 1", or 1-1/2" NPT inlet and outlet ports. All housings come complete with a 3/8" drain valve. The single large ACME thread closure ensures quick opening and positive sealing.