This Tariff Concession Order makes a specific class of soil-densification and reinforcement systems (vibroflots, hydraulic power packs and water‑jetting pumps) eligible for a Schedule 4 tariff concession (item 50) from 21 November 2006. It affects importers of those combined systems by reducing or removing customs duty for qualifying goods; the concession continues until revoked under the Customs Act 1901. Importers must correctly classify and demonstrate the goods match the listed components to obtain the concession.