Connect two pieces of different-sized PEX pipe together using crimp or clamp rings. Corrosion resistant fitting certified for use in potable water and hydronic heating system applications.Features and benefits:Compatible with PEX or PE-RT pipe.Made from high performance Acudel Polymer.Connects to PEX pipe with Copper Crimp Rings or Stainless Steel Clamp Rings.Minimum working temperature 33°F at 160 psi. Maximum working temperature 200°F at 80 psi.Certified for use in potable water and hydronic heating system applications.