NIBCO 9020750PC 3″ Copper Repair Coupling-Press.The NIBCO Press System copper repair coupling features an inboard bead and EPDM O-ring. Simply applying pressure from a pressing tool tightens the O-ring onto the tube, ensuring a clean, watertight seal in seconds with no flame, solder or flux. The coupling has press connections without a tube stop. The fitting provides a method to repair a connection between two lengths of tube.