Tubes, pipes and hoses and fittings thereof (for example, joints, elbows, flanges), of plastics

391710 Plastics; artificial guts (sausage casings) of hardened protein or of cellulosic materials 391721 Plastics; tubes, pipes and hoses thereof, rigid, of polymers of ethylene 391722 Plastics; tubes, pipes and hoses thereof, rigid, of polymers of propylene 391723 Plastics; tubes, pipes and hoses thereof, rigid, of polymers of vinyl chloride 391729 Plastics; tubes, pipes and hoses thereof, rigid, of plastics n.e.c. in heading no. 3917 391731 Plastics; tubes, pipes and hoses thereof, flexible, having a minimum burst pressure of 27.6MPa 391732 Plastics; tubes, pipes and hoses thereof, other than those of item no. 3917.31, not reinforced or otherwise combined with other materials, without fittings 391733 Plastics; tubes, pipes and hoses thereof, other than those of item no. 3917.31, not reinforced or otherwise combined with other materials, with fittings 391739 Plastics; tubes, pipes and hoses thereof, n.e.c. in item no. 3917.30 391740 Plastics; tube, pipe and hose fittings (e.g. joints, elbows, flanges)