The SharkBite EvoPEX straight coupling is engineered to improve efficiency and enable plumbing contractors to optimize install time with clean, leak-free installations. With no soldering, clamps, unions or glue required, it's as simple as inserting PEX pipe into the fitting deep enough to be sealed by our specially-formulated O-ring. Once inserted, the stainless steel teeth bite down and grip the pipe. A green indicator ring will display in the slots around the fitting to visually display that the permanent inner-diameter connection is secure. This push-to-connect fitting is designed to make PEX-to-PEX connections in potable water and radiant heating (including underground or behind-the-wall) applications with no access panels required. Fittings are rated up to 80 psi at 200 deg F, 100 psi at 180 deg F and 160 psi at 73.4 deg F.