Mechanically, this Order declares that certain fibreglass‑reinforced vinyl ester resin pipes (Customs Tariff classification 3917.29.00) with bore not greater than 375 mm are goods to which Item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995 applies, effective 9 January 2008 and continuing until revoked. It therefore changes the tariff treatment that applies to those specific imported pipes. That affects importers (who face a changed duty or administrative regime), customs officials (who must apply the new classification) and related compliance costs.