This Tariff Concession Order (TC 0605047) declares that "clarifiers, ultra violet" classified at 8421.21.90 are covered by item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995, giving an announced tariff concession from 13 March 2006 until revoked. The declaration is made under s.269P of the Customs Act 1901, with revocation powers under ss.269SC and 269SD. Importers get the concession; the Commonwealth forgoes tariff revenue; customs delegates determine classification and entitlement and importers face revocation risk.