The Pentair Pentek 150235 Big Blue filter housing is engineered for whole house and light commercial water filtration systems that demand high flow rates without sacrificing pressure. Its 1-1/2" NPT inlet and outlet ports are the largest available in the Big Blue line, making this housing the right choice when your plumbing requires maximum volume throughput and minimal restriction.Built from durable polypropylene with a high-flow polypropylene (HFPP) cap, this housing accepts any standard 20" x 4.5" filter cartridge. The integrated pressure relief button with 300-series stainless steel internals and EPDM seals allows you to safely release system pressure before unscrewing the sump for cartridge replacement. All wetted materials are NSF/ANSI Standard 42 certified for drinking water contact.Rated for up to 90 psi at operating temperatures of 40-100 degrees F, the 150235 handles heavy-sediment and high-flow residential applications. Overall dimensions are 23.74" x 7.45". Housing includes cap with pressure relief button and EPDM O-ring. Filter cartridge sold separately.