The McAlpine T12E is a durable coupling fitting designed to connect a 1 inch female BSP (British Standard Pipe) threaded pipe to a 2 inch male BSP threaded pipe. This coupling is ideal for use with plastic pipes, ensuring a secure and reliable threaded connection. BSP threads are primarily used in Europe and Asia. In regions like the US, where NPT (National Pipe Thread) threads are common, an adapter or alternative fitting may be required for compatibility.