... tee crossing coupling nipple cap flange etcStandards:ASTM,ASME GBOtherPipe fitting is the occupation of installing or repairing piping or tubing ... various means, and the location and repair of leaks.Pipe fitting work is done in many different settings: HVAC, manufacturing, ... several types of steel, copper, iron, plastic, aluminium. Pipe fitting is not plumbing, the two are related but separate trades ...