Explanatory notes
… applies to non-refractory piping, etc., designed, as a general rule, to interlock and to be used for draining or … The heading includes : (1) Agricultural or horticultural drainage pipes, of porous common pottery, fired at only a … (3) Pipe fittings for connecting or branching (collars, flanges, elbows, T-pieces, clean out traps, etc.). The …