Judgment of the Court (Sixth Chamber) of 25 May 2023.#Skatteministeriet v Danish Fluid System Technologies A/S .#Request for a preliminary ruling from the Vestre Landsret.#Reference for a preliminary ruling – Regulation (EEC) No 2658/87 – Customs Union – Common Customs Tariff – Tariff classification – Combined Nomenclature – Heading 7307 – Tube or pipe fittings – Subheading 7307 22 10