A socket quadrate is composed of a socket, a socket, a bending part and a socket, etc. Its feature is that there is a socket on the socket, and the socket and the socket are located at the two ends of the bending part respectively. In a pipe system, a socket quart is a pipe fitting that changes the direction of the pipe line.

The materials of socket and socket are cast iron, stainless steel, alloy steel, calcined cast iron, carbon steel, non-ferrous metal and plastic, etc.

The main manufacturing standards of socket tee are GB/T14383, ASME B16.11, BS3799.