 Read blueprints, drawings and specifications to determine layout of plumbing system, water supply network and waste and drainage systems  Install, repair and maintain domestic, commercial or industrial plumbing fixtures and systems  Locate and mark positions for pipe connections, passage holes and fixtures in walls and floors  Cut opening in walls and floors to accommodate pipe and pipe fittings  Measure, cut, bend and thread pipes using hand and power tools or machines  Join pipes using couplings, clamps, screws, bolts, cement or soldering, brazing and welding equipment  Test pipes for leaks using air and water pressure gauges  May prepare cost estimates.