塑料及其製品，橡膠及製成品, 40 Rubber and articles thereof, 40.09 -tubes, pipes and hoses, of vulcanized rubber other than hard rubber, with or without their fittings (for example, joints, elbows, flanges):, 40.09.2 -tubes, pipes and hoses, of vulcanized rubber other than hard rubber, with or without their fittings (for example, joints, elbows, flanges): --unboosted or otherwise combined only with metal:, 40.09.21 -tubes, pipes and hoses, of vulcanized rubber other than hard rubber, with or without their fittings (for example, joints, elbows, flanges): --unboosted or otherwise combined only with metal: ---without fittings, 業務, 業務