Working knowledge of plumbing systems, including sewage ejectors, domestic water boosters, industrial domestic hot water systems, circulation pumps, pressure reducing valves, backflow devices, and water supply, waste and vent piping. Guide the team in troubleshooting plumbing systems, including sewage ejectors, domestic water boosters, hot water systems, circulation pumps, pressure reducing valves, backflow devices, and water supply, waste and vent piping.