Responsibilities: Assembles, installs, modifies, and repairs; pipes, fittings, fixtures, various types of valves, backflow preventers, utility systems, disposal systems, sewage systems, water, waste vent and gas distribution systems, oil, compressed air, vacuum, grease trap and acid systems, cooling or heating water systems, drainage systems, hydrants, water closets, tubs, showers, faucets, sinks, commodes, bathtubs, hot water heaters, hot water tanks, garbage disposal units, dishwashers, and water softeners, fire sprinkler systems, and pumps according to specifications and plumbing codes. Assembles and installs valves, pipe fittings, traps, unions, and pipes composed of metals such as iron, galvanized, steel, brass, lead, and nonmetals such as glass, vitrified clay, and plastic, using hand tools and power tools.