The difference between a street elbow and a regular elbow is the gender of its two connections. A regular elbow has a female connection on each end, so it can join two male pipes. ... Instead, a street elbow has a female fitting on one end but a male fitting (either straight or threaded) on the other.
Elbow mainly available in two standard types 90 ° and 45 °. However, it Can be cut to any other degree. Elbows are available in two radius types, Short radius (1D) and Long radius (1.5D).
Fittings are generally used in mechanical and plumbing operations for a number of different purposes. There are many different kinds of fittings, made from a variety of materials: some of the most common types are elbows, tees, wyes, crosses, couplings, unions, compression fittings, caps, plugs and valves.