Commercial refrigerators and freezers and replacement parts and fittings therefor; Air-conditioning apparatus; Pressure regulators for gas installations; Stills not for scientific purposes; Hot water tanks; Thermostatic valves as parts of heating installations; Dripper irrigation systems, comprised of valves, filters; Pipes being parts of sanitary facilities; Coils as parts of distilling, heating or cooling installations; Pipes for heating boilers; Pressure regulators for water installations; Water treatment equipment, namely, cartridge filtration units; Plumbing fittings, namely bibbs, cocks, traps, valves; Plumbing fittings, namely, couplers