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

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CBP Ruling 881423 (8421210000): 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

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