This adapter allows you to connect MDPE water supply pipes to copper pipes. It is compatible with 25mm MDPE compression fittings and 15mm copper pipes. The adapter is essential for creating a watertight seal between MDPE and copper pipes due to their different connection requirements. For a leak-free seal on the copper pipe, it is recommended to use PTFE plumbers tape on the thread where it joins the adapter and around the olive washer. Made from durable polyethylene, this adapter can be reused. It is available in elbow, straight, or tee fitting options.