Connect two pieces of same-sized PEX pipe together using crimp or clamp rings. Certified for use in potable water and hydronic heating system applications. For use with brass or poly PEX crimp fittings.Available in 3/8 in., 1/2 in., 5/8 in., 3/4 in. and 1 in. sizes.Clamp Tool required for installation.For use with PEX or PE-RT pipe.