This lead-free brass ASTM F1960 tee is used to make a three way connection between PERT tubing. This 5/8 in F1960 by 5/8 in F1960 by 5/8 in F1960 branch tee must be joined to the PERT tubing using a F1960 PEX sleeve to form a fast, reliable and permanent seal. It is recommended that a specialized tool be used to make the connection.