Explanatory notes
… Ceramic pipes, conduits, guttering and pipe fittings. This heading applies to non-refractory piping, etc., designed, as … may be of unglazed common pottery, but are often rendered impermeable by glazing or by vitrification (e.g., chemical … or branching (collars, flanges, elbows, T-pieces, clean out traps, etc.). The heading does not cover : (a) …