The Libra Supply Press copper 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 and a roll tube stop. The fitting provides a method to connect two lengths of tube. Libra Supply press fittings are the fastest, easiest way to join copper tubing systems. They are designed to join with seamless copper water tube in residential and commercial potable, hot, chilled and process water applications for plumbing and HVAC systems. The press fittings can also be installed underground. Our Press System is user friendly, quick and easy to install.