This Black Iron 90 Degree Street Elbow is used to connect a pipe to a fitting at a 90 degree angle. It can be used in many plumbing applications, including water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, heating and air conditioning, sump pump drains, and other locations where plumbing fittings would be used to join sections of pipe. Black iron pipe is able to safely handle gas transportation for heating and cooling systems. Its non-corrosive coating makes it one of the strongest pipe options available.