Install, repair and maintain plumbing fixtures and systems, Locate and mark position of pipe connections, holes and fixtures, Cut holes to accommodate pipes and fittings, Join pipes with couplings, clamps, screws, bolts or cement, Inspect and test pipes for leaks, Determine piping system requirements and pipe sizing, Select and install pumps, Install manholes and catch basins, Repair, service and maintain plumbing systems or fixtures.