11 Hydronic heating and cooling systems comprised of manifolds, manifold accessories, namely, adapter valves, air vents, fill and purge valves, isolation valves, mounting brackets, actuators, unions, plugs, caps, and connectors, wet and dry system flooring panels, piping, valves, fittings, gauges, controls, hydronic mechanical panels, pumps, air separators, backflow preventers and expansion tanks for distributed water heating and cooling systems, sold as a unit; valves being parts of washing machines; Devices and accessories for use with liquid and gas plumbing, namely, valves, Y-strainers, fittings, polymeric pipe unions, venturi pipes, stops, air purgers, air vents, backflow preventers, screens, drains, bibbs, sillcocks, valve locks, valve stops, valve stem extensions, valve handles, faucets, polymeric pipe couplings, and anti-scald fittings; Gas burner bars for commercial and residential use; Evaporative air cooler valves; Plumbing fittings, namely, adapters, ball valves, couplers, gate valves, globe valves, hose bibbs, low pressure valves, stop valves, stop and waste valves, thermoplastic valves; Liquid and gas plumbing devices, namely, valves, Y-strainers, pipe unions, stops, air purgers, air vents, tee-pipes, venturi pipes, backflow preventers, screens, drains, bibs, sillcocks, valve locks, valve stops, valve stem extensions, valve handles, faucets, anti-scald valves, and fittings, namely, threaded connectors; Fluid floats, namely, float valves and float rods