Used in building sewer networks, these 3‑way connectors reduce the pipe diameter into a 45° branch. As plumbing might require connecting pipes of different sizes at different angles, a suitable fitting is needed to allow leakage‑free flow transport between the two connecting pipes. The “Wyee Reducer 45° ” made by Khuzestan Hose and Pipe Co. according to BSEN 1329‑1 and INSO 9119‑1 best suit the purpose.