Nodular cast iron pipe fitting for connecting prestressed concrete cylinder (PCCP)

The nodular cast iron pipe fitting for connecting the PCCP comprises a first spigot-and-socket straight pipe, one end of the first spigot-and-socket straight pipe is connected with a spigot-and-socket disc tee joint, a second spigot-and-socket straight pipe is installed at the other end, located on the same straight line with the spigot-and-socket straight pipe, of the spigot-and-socket disc tee joint, and a spigot-and-socket bent pipe is installed at the other end of the second spigot-and-socket straight pipe. The other end of the spigot-and-socket elbow is provided with a third spigot-and-socket straight pipe, the other end of the third spigot-and-socket straight pipe is provided with a spigot-and-socket disc mud discharging tee joint, the other end of the spigot-and-socket disc mud discharging tee joint is provided with a fourth spigot-and-socket straight pipe, and the end of the spigot-and-socket disc tee joint, the end of the spigot-and-socket elbow and the end of the spigot-and-socket disc mud dischargi