A street elbow is a type of plumbing or plumbing connection intended to join a piece of pipe and another corner fitting. The difference between a street bend and a regular bend is the nature of the connections at each end.
A regular elbow has a female connector or FIP connection at both ends. A hub is a female receptacle made of ABS, PVC or copper; FIP refers to 'Female Iron Pipe' threads, meaning it receives a threaded MIP pipe made of brass or plastic at both ends. FIP is also known as FPT, Female Pipe Thread, and MIP is also known as MPT, Male Pipe Thread. Collectively, they are known as NPT fittings. Instead, a street bend has a female connector at one end and a male or MIP connector at the other end. The advantage of the street elbow is that it can be connected directly to another fitting without having to use an extra short connecting piece called a pipe nipple.
Street bends are available in 90 °, 45 ° and 22.5 ° bends. They can be used for water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, HVACs, sump pump drains and other locations where the pipe sanitary fittings.