This Order declares that specific "domestic gas modules" (tariff classification 8421.39.00, described by technical features such as feed heating, dewpoint controls, export compression, phase separation and MEG regeneration) are eligible for the Schedule 4 Item 50 tariff concession, effective 14 July 2011. It changes customs duty treatment for importers and manufacturers; eligibility is determined by customs officials and the concession may be revoked under sections 269SC/269SD of the Customs Act 1901. Compliance and verification costs fall mainly on importers.