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Pentair Pentek BBFS-22 Big Blue Two-Housing Filtration System, 1" NPT #20 High Capacity Water Filter Housing, Holds 20" x 4.5" Filter Cartridges. Ships completely Pre-Assembled to save valuable installation time and space. Two Big Blue Housings can house any 20" x 4.5" filter cartridge; ideal for a two-stage sediment/carbon filtration set-up. Filtration System consists of filter housings, wall-mounting bracket and hardware. Equipped with Pressure Relief button to relieve housing pressure during cartridge change. Durable Polypropylene Housings have excellent chemical resistance.