Poly-butylene pipes; couplings (joints) made of non-metallic materials for pipes; flexible lining materials for pipes; flexible pipes (not of metal); flexible pipes made of polymeric materials; flexible pipes of plastics (other than parts of sanitary installations); flexible plastic pipe insulation; insulation materials for pipes; junctions, not of metal, for pipes; non-metallic connectors for pipes; non-metallic coupling sleeves for pipes; non-metallic couplings for flexible pipes; non-metallic couplings for pipes; non-metallic elbow joints for flexible pipes; non-metallic fittings for pipes non-metallic structures for noise abatement (insulation), non-metallic structures for noise abatement (soundproofing), non-metallic structures for noise absorption (insulation), non-metallic structures for noise absorption (soundproofing), structures for noise absorption (soundproofing) non-metallic rigid irrigation pipe fittings, connectors, couplings, valves, spike assemblies, parts and fittings therefor; plastic pipe fittings, being goods in class 17; goods made from polymers including elastomers, including plastics in extruded form; pipes and pipe liners made from polymeric materials; non-metallic drainage pipes; fittings for pipes and conduits, of non-metal; non-metallic pipe connections; pipe outlets, not of metal; non-metallic pipe couplings; non-metallic fittings for pipes; non-metallic hose fittings; non-metallic joints for pipes; non-metallic sealing rings for hose fittings; non-metallic sealing rings for pipe fittings; non-metallic tube fittings