PureT - B907 Series - 10" Big Blue Double O-Ring Filter Housing Black Cap / Blue SumpPureT B907 Series 10" Big Blue Double O Ring Filter Housing Black Cap Blue Sump NSF certified polypropylene housing engineered for high flow whole house and commercial filtration with reinforced walls and 1" NPT ports NSF Certified FDA Grade Polypropylene 100 PSI Max 1" NPT WHY IT WORKS Built for high flow applications that demand reliability Reinforced Construction Thicker walled polypropylene housing withstands pressure cycling and thermal stress in