Connectors, not of metal, for pipes and hoses; couplings (joints) made of non-metallic materials for pipes; couplings of plastic for pipes; fittings (non-metallic) for flexible pipes; flexible connectors for splicing pipes; flexible pipes (not of metal); flexible pipes made of polymeric materials; flexible pipes of non-metallic materials, (other than parts of sanitary installations); flexible pipes of plastics (other than parts of sanitary installations); 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 flexible corrugated pipes (other than for sanitary installations); non-metallic pipe connections; non-metallic pipe couplings; non-metallic pipe extensions; non-metallic pipe fittings (junctions); non-metallic pipe linings; non-metallic pipe sleeves; non-metallic pipe unions; non-metallic semi-rigid pipes for use with pressurised fluids; plastic elbow bends for pipes (other than parts of sanitary installations)