Plumbers perform some or all of the following duties:

A. Read blueprints, drawings and specifications to determine layout of plumbing system, water supply network and waste and drainage systems

B. Install, repair and maintain domestic, commercial or industrial plumbing fixtures and systems

C. Locate and mark positions for pipe connections, passage holes and fixtures in walls and floors

D. Cut opening in walls and floors to accommodate pipe and pipe fittings

E. Measure, cut, bend and thread pipes using hand and power tools or machines

F. Join pipes using couplings, clamps, screws, bolts, cement or soldering, brazing and welding equipment

G. Test pipes for leaks using air and water pressure gauges