Watts 18P-16 Poly Alloy PEX Tee 1-Inch Barb x Barb x Barb Low-Lead 1-Inch x 1-Inch x 1-Inch Barb Poly PEX Tee Poly-Alloy fittings are produced from an engineered thermoplastic polymer resin This fitting offers many improved performance characteristics that make it an excellent choice in the demanding environment of a hot and cold-water plumbing system Manufactured in accordance with American Society for Testing and Materials (ASTM) F-877 and F-2159 Listed by the National Sanitation Foundation to NSF Standards 14 and 61 for use in potable water systems, and are certified to Canadian Standard Association B137.5