Tariff Concession Order 1107613 applies item 50 of Part III, Schedule 4 of the Customs Tariff Act 1995 to imported pressure‑relief valves that are certified to ASME Boiler and Pressure Vessel Code, Section VIII, changing their customs tariff treatment. It takes effect from 01.03.11 and continues until revoked. It primarily affects importers of those valves (who must supply ASME Section VIII certification) and was made by a delegate under section 269P of the Customs Act 1901, with revocation available under sections 269SC/269SD.