17 Junctions, not of metal, for pipes; connecting hose for vehicle radiators; fittings [non-metallic] for flexible pipes; fittings, not of metal, for rigid pipes; flexible hoses, not of metal; plastics in extruded form for use in manufacture; stopping materials; latex [rubber]; gutta-percha; asbestos; mica; substitutes for unprocessed and semi-processed rubber; substitutes for unprocessed and semi-processed gutta-percha; substitutes for unprocessed and semi-processed gum; substitutes for unprocessed and semi-processed asbestos; substitutes for unprocessed and semi-processed mica