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8481.30.10
Swing check-valves, of cast iron, with an inlet of internal diameter of 4 cm or more but not exceeding 60 cm
8481.30.20 Of copper or copper alloys, with an internal diameter of 2.5 cm or less
8481.30.40 Of plastics, with an internal diameter of not less than 1 cm and not more than 2.5 cm
8481.30.90 Other