This Tariff Concession Order (TCO 0933136) declares that specific parts for aeration systems—membranes and grommets, classified at tariff heading 4016.99.00—are subject to the Item in Part III of Schedule 4 to the Customs Tariff Act 1995. It took effect 7 Sept 2009 and remains until revoked (made under s.269P of the Customs Act 1901; revocation under ss.269SC/269SD). Importers of these parts can claim the Schedule 4 tariff treatment when clearing goods; they must correctly classify and document claims and face the administrative compliance and revocation risk.