Under general supervision of designated supervisor, to install, maintain and repair heating and plumbing systems. Repairs and maintains plumbing by replacing defective equipment, replacing or mending broken pipes, and opening clogged drains. Assembles pipe sections, tubing and fittings, using screws, bolts, solder, plastic solvent, and caulking. Cuts opening in structures to accommodate pipe and pipefittings, using hand and power tools. Locates and marks position of pipe installations and passage holes in structures, using measuring instruments such as ruler and level. Studies building plan and inspects structure to determine required materials and equipment and sequence of pipe installations. Installs pipe assemblies, fittings, valves, and fixtures such as sinks, toilets and tubs, using h