Specifications include, but are not limited to: • The repair or replacement of all domestic hot and cold water supply, re-circulating line auxiliary equipment, such as controls, valves and fittings and fittings and repair or replacement of all soil, waste, vent and discharge piping of the storm and sanitary drainage systems of all buildings of the District. • Assemble, install and repair pipes, fittings and fixtures or water, gas and waste disposal systems according to specifications and plumbing codes. • Work with piping systems that transport liquid, gas or semisolid material. • Install sinks, hot water tanks and connections. • Maintain existing plumbing systems. • Follow blueprints if required. • Trace troubles in current plumbing systems, open clogged drains and pipes, thaw frozen pipes and replace worn parts. • Extend piping systems to connect new fixtures to water and drainage systems.