This lead-free crimp adapter is used to make a straight transition between copper pipe and radiant heating PEX tubing. This 1-1/4 in crimp by 1-1/4 in male threaded adapter is made of lead-free poly alloy and must be joined to the PEX tubing using a copper crimp ring or stainless steel CinchClamp™ to form a fast, reliable and permanent seal.