3917: Tubes, pipes & hoses & fittings therefor of plastics

391710: Sausage casings of hardened protein or of cellulosic materials 391721: Tubes, pipes and hoses, rigid; of polyethylene 391722: Tubes, pipes and hoses, rigid; of polypropylene 391723: Tubes, pipes and hoses, rigid; of polyvinyl chloride 391729: Tubes, pipes and hoses, rigid; of plastics nes 391731: Tubes, pipes & hoses, flexible, plastic, minimum burst pressure of 27 391732: Tubes, pipes and hoses nes, plastic, not reinforced etc, without fitt 391733: Tubes, pipes and hoses nes, plastic, not reinforced etc, with fitting 391739: Tubes, pipes and hoses nes, plastic 391740: Fittings, plastic 3917: Tubes, pipes & hoses & fittings therefor of plastics