Street elbow
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A street elbow is a type of plumbing or piping fitting intended to join a piece of pipe and another fitting at an angle. The difference between a "street" elbow and a regular elbow is the nature of the fittings on either end.
A regular elbow has hub or FIP on both ends. ("Hub" is a female ABS, PVC or Copper pipe receiver; FIP = "Female Iron Pipe" threads, ie. receives threaded iron, brass or plastic pipe) on both ends.
A street elbow has a female fitting (Hub or FIP) on one side and a male pipe or MIP fitting on the other end. ("Pipe" since it matches the dimensions of the pipe and therefore will go into any fitting which accepts pipe. "MIP" = "Male Iron Pipe" threads; the standard tapered thread cut into pipe). The advantage of the street elbow is that it can be connected directly to another fitting without having to use a pipe nipple (short piece of connecting pipe).
Street elbows are available in 90°, 45° and 22.5° bends. They can be used in water supply, drainage, sewer vents, central vacuum systems, compressed air and gas lines, HVAC, sump pump drains, and any location where plumbing fittings would be used to join sections of pipe.