Mechanically, this Order declares that a specific imported product — a subsea gas-well “Christmas tree” with bore greater than 160 mm (tariff classification 8481.80.90) — is subject to item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995. It takes effect from 9 August 2005 and remains until revoked. This matters to importers and Customs because it changes the tariff treatment of that narrowly defined product, altering import costs and compliance obligations for anyone importing that equipment.