17 Flexible pipes, tubes, hoses and fittings therefor, including valves, and fittings for rigid pipes, all non-metallic; asbestos packing for valves; graphite packing for valves; clack valves of rubber; valve packing sets; valves of synthetic rubber; thermal insulation jackets for valves; valves of india-rubber or vulcanized fiber; pipe fittings (junctions), non-metallic; valve sleeves; Non-return valves of rubber; Non-metallic pipe sleeves; Non-metallic coupling sleeves for valves; Non-metallic coupling sleeves for tubes; Rubber hose; Non-metallic hose pipes; Pinch valves for flexible pipes, tubes and hoses