TARIC 8421.99.90.92 — Parts of equipment for the purification of water by reverse osmosis, consisting essentially of plastic-based membranes, supported internally by woven or non-woven textile materials which are wound round a perforated tube, and enclosed in a cylindrical plastic casing of a wall-thickness of not more than 4|mm, whether or not housed in a cylinder of a wall-thickness of 5|mm or more | TariffCodex