Install, alter, and repair valves, fittings, and other plumbing parts and equipment, including such items as hot water boilers, sterilizers, steam tables, sinks, thermal control apparatus, sprinkler heads, hydrants, and service pipes. Cut, bend, assemble, and install various pipes, fittings, and fixtures for water, sanitary, drainage, heating, gas, and other plumbing systems which involve the performance of hand, bench, and maintenance plumbing tasks.