5. Performs routine to difficult plumbing duties, inspecting, installing, repairing and replacing pipes, fittings and plumbing fixtures, unclogging sinks and toilets, repair of faucet, assemblies and replacement of washers, repairs or replacement pipes, repair of fountains, etc. 3. Performs routine to difficult carpentry duties, including installation of new doors and installation or repairs of doorjambs, moldings, hinges, door closers, locks, knobs, shelving and counter installation, ceiling tile/grid repair and installation, etc.