11
Installations for heating, water supply and sanitary purposes; pipes and tubes, being parts of sanitary installations
17
Non-metallic hose pipes used for water supply, gas distribution, soil drain waste, drainage, irrigation, electrical conduit and cable ducting systems, central heating systems and chemical industry; non-metallic pipes for water supply, gas distribution, central heating systems and chemical industry, elements and molding pieces for such pipes and replacement parts and fittings therefor, namely plastic couplings, bends and junctions; plastic tees, and plastic pipe liners
19
Non-metal gutters and non-metallic pipes used for pressure and non-pressure applications, namely water supply, gas distribution, drain waste and vent, foul sewers and storm water drainage; non-metal downpipes for discharge of rainwater; non-metal gullies for discharge of surface water, non-metal manholes; infiltration units, namely hollow plastic constructions for temporary storage of rainwater for later discharge into the sewer system or infiltration into the soil; plastic inspection chambers, namely manholes of insufficient size to contain a person
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