The 1/2 in. Copper Press Tube Cap copper press fitting is NSF Listed, lead free and features a robust EPDM O-Rings to ensure a clean leak free seal.Copper press fittings are designed for mechanical connection to ASTM B88-Type K, L and M copper tubing in hard drawn condition. Utilizing a hydraulic press tool, a watertight seal can be made in seconds without no flame, solder or flux.Each press fitting comes standard with leak before press technology to easily identify a fitting that has not been pressed.Connections can be made in wet or dry conditions reducing project downtime.These fittings are available in sizes from 1/2 in. to 1 in. and are compatible with all major hydraulic press tools.