This quick-connect elbow fitting works with copper, CPVC, PEX, LPDE, MPDE, HDPE and polybutylene tubings. It is easy-to-install no tools or tube inserts are required. The fitting can be used for hot and cold water applications. The unique O-ring guide feature insures zero-leak connections. Unlike barb fittings, this fitting joins the tubing on the outside, increasing the flow capacity. After a connection has been made even under maximum pressure, the tubing is able to swivel, making it ideal for vibrating and dynamic applications.