Pentek Housing for 20'' Cartridge, Port Size: 1 1/2'', Sump: Blue, Cap: Black, High-Flow PolyPropylene, Comes with Pressure Relief Button. Single unit.

Big Blue filter housings offer 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