This Tariff Concession Order (TCO 0608179) declares certain waste-biomass gasifiers (tariff classification 8405.10.00 — wood chip gasifiers with torsional combustion chambers and circulation boilers) to be goods covered by item 50 of Part III, Schedule 4 to the Customs Tariff Act 1995, effective 11 May 2006 (made under s269P of the Customs Act 1901). Importers of these specified gasifiers can rely on the Schedule 4 concession while the order remains in force; the concession can be revoked under ss269SC or 269SD, which shifts duty costs and sourcing incentives.