This Tariff Concession Order, made under s.269P of the Customs Act 1901, treats specified relief valves (Tariff heading 8481.40.00) as goods covered by Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995, effective 4 May 2011. Mechanically, that lets importers clear those valves under the Schedule 4 concession (reducing customs duty); the order was issued by a CEO delegate and can be revoked under ss.269SC–269SD, so importers must use the correct tariff classification and monitor for revocation.