Directly from The Famous Pex Systems Manufacture Lead Free Brass Fittings Size 1/2 Inch push x 3/8 Inch Comp and 1/4 Turn on/off Fit Copper, PEX, CPVC and PE-RT Pipe 200 PSI and 200 Degrees F. Use in Potable Water and Hydronic Heating Applications. No Tools, No Soldering, No Crimping or Glue. Push to Connect