Cuts and threads; assembles and installs a variety of metal and nonmetal pipe fittings, including those made of brass, copper, lead, glass and plastic; joins pipe by means of threaded, Caulk, solder, braze, fuse or cement joints; secures pipe to structure with clamps, brackets and hangers; installs and maintains refrigeration and air-conditioning systems including compressors, pumps, meters, pneumatic and hydraulic controls and piping; test piping system for leaks. The Pipefitter II performs skilled fabrication, assembly, installation, construction, and maintenance of piping through plan interpretation.