Explanatory notes
… This heading does not however cover articles used for installing pipes and tubes but which do not form an integral … pieces, couplings or sleeves, clean out traps, nipples, unions, clamps and collars. The heading excludes : (a) … fittings ( heading 73.18 ). (c) Thermostatic bellows and expansion joints ( heading 83.07 ). (d) Ha n gers, stays …