When connecting reducing tee fittings, use the flanged fittings and the parts connected to each other to connect to the pipe end. There are holes on the flange, and bolts make the two flanges tightly connected. Seal the flanges with gaskets. Reducing tee refers to a pipe fitting with a flange. It can be cast, threaded or welded. The reducer tee connection consists of a pair of flanges, a gasket, and several bolts and nuts. The gasket is placed between two flange sealing surfaces, and after tightening the nut, the specific pressure on the gasket surface reaches a certain value, causing deformation. The uneven areas on the sealing surface are filled to ensure a tight connection without leakage. Flange connection is a detachable connection.