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