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Heading 6906 : Ceramic pipes, conduits, guttering and pipe fittings.
This heading applies to non-refractory piping, etc., designed, as a general rule, to interlock and to be used for draining or for the distribution of fluids. They may be of any shape or section (straight, curved, branched, of constant or varying diameter, etc.), and may be glazed.
The heading includes :(1) Agricultural or horticultural drainage pipes, of porous common pottery, fired at only a low temperature and roughly finished. (2) Other pipes, conduits and guttering (e.g., rain-water drain-pipes, sewer pipes, conduit tubing to protect electric cables but not designed to act as insulators, half tubes in the form of gutters or runways, wall drainage tubes).
These pipes, etc., may be of unglazed common pottery, but are often rendered impermeable by glazing or by vitrification (e.g., chemical piping). (3) Pipe fittings for connecting or branching (collars, flanges, elbows, T-pieces, clean out traps, etc.). The heading does not cover : (a) Tubular chimney-parts (e.g., chimney-pots, cowls, chimney liners and flue-blocks) (heading 69.05). (b) Small tubes and tubing (e.g., combustion tubes), usually of porcelain or china, specially designed for laboratories (heading 69.09). (c) Insulating electric conduit tubing and joints, and all tubular fittings designed for electrical uses (headings 85.46 and 85.47 in particular).
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clhs@clhs.co.kr 
070-4214-8300