The McAlpine T12H is a coupling fitting that connects a 1 1/2-inch female BSP (British Standard Pipe) threaded pipe to a 1-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 National Pipe Straight threads. ・ Available in 9 sizes ・ Waste Outlet Reducer