LEAD FREE Made of brass. For use with PEX plumbing systems. For hot or cold water. Meets ASTM F-876 and F-877 to SDR-9 dimensional standards. Listed by the National Sanitation Foundation to NSF Standards 14 and 61 for use in potable water systems. Listed by NSF to be in compliance with the Uniform Plumbing Code. Sizes are CF (crimp fitting) x CF (crimp fitting). Bagged.