This Polyphenylsulfone ASTM PPSU F1960 elbow is used to make a 90 degree transition between WaterPEXa tubing. This 1 inch F1960 by 1 inch F1960 elbow must be joined to the PEX 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.