WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
83.07 Flexible tubing of base metal, with or without fittings. 8307.10 - Of iron or steel 8307.90 - Of other base metal There are two main types of flexible metal tubing, differing according to the process of manufacture : (1) Flexible tubing composed of a shaped strip rolled spirally, with or without fastening of the edge. Tubing of b s e may be rendered water or gas tight by packing with rubber, asbestos, textiles, etc. t is then suitable for use as watertight protection for electric cables or flexible transmission systems; vacuum cleaner tubin conduits for compressed air, steam, as, water, petrol, 011 or other fluids in engines, mac ine-tools, pumps, transformers, hydrau!I ic or pneumatic appliances, blast furnaces, etc. Similar tubing not rendered watertight is used as condwts for sand, ain, dust, shavings, etc., and also, m certain cases, for protecting electric cables, other flex1 le transmission piping, rubber tubing, etc. P % '% (2) Corrugated flexible tubing obtained, e.g., by deformation of a smooth-surfaced pipe. This tubing is by its nature water and air tight, and can be used without M e r processmg for the purposes described in paragraph (1) above. In order to increase their resistance to ressure, both types of flexible tubing may be reinforced or equipped with one or more brai ed sleeves of wire or metal strip. These sleeves are sometimes protected by spiralled wire, and may also be covered with plastics, rubber or textile material. i' The headin also covers flexible tubin corn osed of tightly spiralled wire (e.g., as used as sheathing or " Bowden " cables or cyc e bra!i e cables). It does not cover similar roducts which are not used as tubes or pipes (e.g., extending curtain wire) (generally heading 7x26). ? Flexible tubing in short lengths for thennic or antivibratory uses (known as thermostatic bellows or expansion joints) remains in this heading. The heading also includes tubing fitted with sockets, joints, etc. This heading also excludes : (a) Rubber tubing incorporating or fitted with external metallic reinforcement (heading 40.09). (b) Flexible tubing made into the form of machinery or vehicle parts, etc., e.g., by assembly with other materials (Sections XVI and XVII). -
1.- For the purposes of this Chapter, parts of base metal are to be classified with their parent articles. However, articles of iron or steel of heading 73.12, 73.15, 73.17, 73.18 or 73.20, or similar articles of other base metal (Chapters 74 to 76 and 78 to 81) are not to be taken as parts of articles of this Chapter. 2.- For the purposes of heading 83.02, the word “castors” means those having a diameter (including, where appropriate, tyres) not exceeding 75 mm, or those having a diameter (including, where appropriate, tyres) exceeding 75 mm provided that the width of the wheel or tyre fitted thereto is less than 30 mm.