This Order names “catalyst coolers, fluid catalytic cracking” (tariff heading 8419.50.90) as goods to which Part III, Schedule 4 item 50 of the Customs Tariff Act 1995 applies, effective 1 June 2005 until revoked (made under s.269P of the Customs Act 1901; revocable under ss.269SC/269SD). Mechanically, it changes which Schedule 4 item governs the customs treatment of those imported goods, so importers and customs declarants must follow the legal tariff treatment and associated compliance obligations tied to that Schedule item.