This lead free brass ASTM F1960 adapter is used to make a straight transition between copper pipe and PEXa or PERT tubing. This 1/2 inch female sweat by 3/8 inch ASTM F1960 adapter is made of lead free brass and must be joined to the PEXa or PERT tubing using a ASTM F1960 PEX sleeve to form a fast, reliable, and permanent seal. It is recommended that a specialized tool be used to make the connection.