Heating systems composed primarily of tubes, pipes and manifolds through which warm or high temperature water circulates; Heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which cold or low temperature water circulates; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, solar panels, control panel, switches and electrical wire, all sold as a unit; Manually-operated plumbing valves; Plumbing fittings, namely, valves for regulating the flow of liquids, whose purpose is to balance, regulate, filter, divert, isolate, measure or separate flow and/or pressure, in dynamic or static systems, said valves being controlled by manual, mechanical, analog or digitally controlled means, used in heating ventilation and air conditioning package units, air handlers, cooling units, heat exchangers, namely, chillers, boilers and cooling towers, irrigation, sanitation, pumps, filters, separators systems, pipelines and piping systems; Plumbing fittings, namely, valves; Pressure regulators for water installations; Regulating accessories for water or gas apparatus and pipes; Regulating accessories for water supply, namely, metered valves; Thermostatic valves as parts of heating installations