PureT - B908 Series - 20" Big Blue Double O-Ring Filter Housing Black Cap / Blue SumpPureT B908 Series 20" Big Blue Double O Ring Filter Housing Black Cap Blue Sump Industrial grade polypropylene housing engineered for high flow whole house and commercial filtration systems up to 100 PSI NSF Certified FDA Grade Polypropylene 100 PSI Maximum WHY IT WORKS Built for demanding residential and commercial applications Reinforced Construction Thicker polypropylene walls provide increased durability and pressure resistance. Four molded