7
Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); machines, apparatus and installations for sewage and waste water treatment; machines, apparatus and installations for sewage and waste water disposal; filtering machines used in sewage and waste water handling; separators; sewage pulverisers; sewage transport machines; washing apparatus for sewage treatment plants; non-return valves of plastic [parts of machines]; electric pumps; rainwater harvesting and filtration machines; parts and fittings for all the aforesaid goods
11
Apparatus for lighting, heating, steam generating, drying, ventilating, water supply and sanitary purposes; air conditioning apparatus; sanitary installations; sewage treatment plants; installations, equipment and apparatus for water, waste water, sewage, sludge and solid waste treatment; installations, equipment and apparatus for the purification of water; fermentation installations for treating sewage; machines for the processing [purification] of sewage; settler apparatus for sewage; rotating biological contactor apparatus; liquid separators; grease separators and digesters; filter apparatus; filtering installations for water; rainwater harvesting and filtration apparatus; parts and fittings for all the aforesaid goods
20
Storage tanks and vessels; storage tanks and vessels of plastics and/or resinous materials; septic tanks, cesspools, silage effluent tanks, petrol storage tanks; water-pipe valves of plastic; non-return valves of plastic [other than parts of machines]; water control valves of plastic; parts and fittings for all the aforesaid goods