Tariff Concession Order 0829430 declares that imported steam parallel‑slide valves (tariff classification 8481.80.90) are to be treated under Item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995, effective 3 September 2008 and continuing until revoked (made under s269P; revocation under ss269SC/269SD).
Mechanically, the Order attaches a specific Schedule 4 tariff treatment to those imports — changing customs duty treatment for importers, shifting relative costs between importers and domestic suppliers, and placing compliance and administration with Customs under the Act.