Automatic water main flushing units, namely, an automated programmable valve as part of plumbing installations for purging underground drinking water distribution systems; fire hydrant assemblies incorporating a hydrant barrel and shoe replacement parts for fire hydrant assemblies; fire hydrants; fire hydrants and replacement parts therefor, namely, hydrant pumper nozzles, hydrant pumper nozzle caps and hydrant safety flanges; fire hydrants for use by municipal utility providers and building construction companies; hydrants; plumbing fittings, namely, cocks and valves; pump inlet suction diffusers for mounting to pump inlet flanges to reduce fluid flow turbulence or to streamline fluid flow and trap foreign materials; plumbing fittings, namely, valves used in piping systems for potable water and wastewater applications to exhaust or admit air during filling or draining or while pressurized; water flushing systems comprising pipes, tubes, hoses, bibbs, cocks, couplers, flow control valves including timer control valves and temperature control valves and programmable valve controllers all for use in water distribution systems, emergency eye wash stations, safety showers, drinking fountains, hospitals, schools, houses, buildings, oil refineries, and chemical plants and optionally providing water flushing, water sampling, dechlorination, backflow prevention, and temperature control being freeze protection and scald protection