Pentek 150237 #10 Big Blue Filter Housing, 1" Female NPT Inlet/Outlet Large filter housing for high-flow and heavy sediment applications Reinforced polypropylene sump for strength and chemical resistance Use with a 10 x 4-1/2 filter cartridge (sold separately) Pressure relief button for easier cartridge replacement Initial pressure drop of 1 psi at a flow rate of 15 gpm