Pentair Pentek BFS-201 Slim Line Two-Housing Filtration System, 3/8" NPT #10 Low Profile Water Filter Housing, Holds 10" x 2.5" Filter Cartridges. Ships completely Pre-Assembled to save valuable installation time and space. Two Slim Line housings can house any 10" x 2.5" 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.