Applies item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995 to imports described as tariff classification 8536.50.99 — "SWITCHES, waterflow activated, vane type" — effective 28 May 2009 and continuing until revoked under sections 269SC or 269SD. Mechanically, the order makes that tariff treatment available to importers of these switches, changing the duty outcome for those goods and creating an incentive to import them while imposing classification and documentation obligations on importers and customs officials.