Mechanically, this Tariff Concession Order (under s.269P of the Customs Act 1901) declares that “packers, grout hole, expandable pressurised injection” (tariff heading 3926.90.90) are subject to Schedule 4 Item 50 of the Customs Tariff Act 1995, changing their import tariff treatment from 30.09.2005 until revoked (ss.269SC–269SD). It affects importers of that specific product (who receive the concession) and is authorised by a delegate of the Chief Executive Officer, so compliance relies on correct classification and continued administrative approval.