PRD 30 04-96-100796; Potable Water Fill/Flush Cart; Wheeled Apparatus Used to Flush and Disinfect Aircraft Water Systems; Filtering or Purifying Instruments and Apparatus, Heading 8421; Principal Purpose, Section XVI, Note 5; Chapter 84, Note 7; Articles of Iron or Steel, Heading 7326; Civil Aircraft Agreement

The tariff classification of slaughterhouse equipment fromHolland

Water Treatment Units; Explanatory Note 84.21(II)

The tariff classification of oil/water separators from the Czech Republic

The tariff classification of a water conditioner from Germany

The tariff classification of an aquarium filter from ChinaDear Mr. Cohen:In your letter dated December 16, 1992 you requested a tariff classification ruling.The aquarium filter consists of a foam plastic donut that is wrapped around a polystyrene base which is weighted with iron, a PVC uplift tube and an airstone, composed of sand and glue, that is attached to the uplift tube. In use the whole filter is submerged in an aquarium tank.An air pump will be attached by plastic tubing to the nipple at the top of the inner tube of the uplift tube. Air is blown down through the inner tube and airstone. This causes bubbling, which in turn creates a suction effect that draws water through the sponge and base, up through the outer uplift tube. As it is drawn through the sponge, food particles and other impurities are retained by the sponge.The applicable subheading for the aquarium filter will be 8421.21.0000, Harmonized Tariff Schedule of the United States (HTS), which provides for machinery