11
Systems for distribution of air as part of HVAC systems, comprised of pipes, fittings, ducts, registers and valves; water heaters and water coolers; sewage disposal plants; flushing devices in the nature of toilet flush valves; water closet filling valves being manually operated plumbing valves; irrigating equipment, namely, irrigation sprinklers and irrigation spray nozzles; complete micro-irrigation units for agricultural use, comprising, valves, filters, regulators, pipes, tubing, emitters, and timers
17
Rubber and products made of rubber, namely, rubber gaskets for piping; plastics in extruded form for use in manufacture; flexible pipes not of metal; plastic flexible pipes and plastic fittings, namely, couplings and junctions
19
Building materials of plastic, namely, folding doors, plastic plinths; roofing accessories, namely, roof ridges and eaves; non-metallic rigid pipes for building or industry, namely, piping for water distribution, sewage, drainage, irrigation, and rainwater; non-metallic rain gutters and drainage channels; and ventilation devices, namely, non-metal vents for commercial building ventilation
35
Business management of industrial or commercial enterprises in the field of building materials, installations and apparatus for heating, ventilating, water supply and sanitary purposes, pipes, conduits, drains, seals, parts, components and accessories of those products