Completely and independently installs, repairs, and maintains pumps, valves, traps, waste and sewage plumbing systems, sprinkler systems, etc., on buildings, power houses, yards, motor coaches, passenger coaches, and work equipment . Completely and independently plans, lays out, repairs, dismantles, rebuilds, maintains, installs, fabricates, high and low pressure pipeline systems which carry steam, water, air, oil, gas, solvents, etc.