The McAlpine T12E is a coupling fitting that connects a 1 1/2-inch female BSP (British Standard Pipe) threaded pipe to a 2-inch male BSP threaded pipe. This coupling is designed for use with plastic pipes and features a push-fit connection, which makes installation quick and easy. It's important to note that BSP threads are used primarily in Europe and Asia, while the US typically uses NPT (National Pipe Thread) or NPS (National Pipe Straight) threads. Therefore, if you are in the US or another country that primarily uses NPT or NPS threads, you may need to use an adapter or different type of fitting to connect your pipes. Available in 9 sizes Waste Outlet Reducer McAlpine T12E 1.5" x 2" BSP Female x BSP Male Coupling in White