Directly from One of the Biggest Plumbing Systems Manufacturers 6 Ports Closed Pex-A Expansion Poly PPSU Manifold 3/4 Trunk, 1/2" Ports, Lead Free Made of Poly(PPSU), Better Performance than Brass Manifold in RO, Chlorinated Water Application Compatible with all Types of Brands of Pex A Pipe/Tubing Expanding Connection Compatible with Expanion Fitting System, NOT Compatible with Stainless Steel Clamp & Copper Crimp Ring Systems; Certified with ASTM F1960 NSF/ANSI 61 NSF 372,Safe for Potable Water Directly from One of the Biggest Plumbing Systems Manufacturers 2 Pack 6 Ports Closed Pex-A Expansion Poly PPSU Manifold 3/4 Trunk, 1/2" Ports, Lead Free Made of Poly(PPSU), Better Performance than Brass Manifold in RO, Chlorinated Water Application Compatible with all Types of Brands of Pex A Pipe/Tubing Expanding Connection Compatible with Expanion Fitting System, NOT Compatible with Stainless Steel Clamp & Copper Crimp Ring Systems; Certified with ASTM F1960 NSF/ANSI 61 NSF 372,Safe for Potable Water