Section 16 Machinery and mechanical appliances; electrical equipment; parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers and parts and accessories of such articles 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof 84 81 Taps, cocks, valves and similar appliances for pipes, boiler shells... 84 81 30 Check valves Commodity Code Description 84 81 30 00 Check valves 84 81 30 10 Swing check-valves, of cast iron, with an inlet of internal diameter of 4 cm or more 84 81 30 20 Of copper or copper alloys, with an internal diameter of 2.5 cm or less 84 81 30 40 Of plastics, with an internal diameter of not less than 1 cm and not more than 2.5 cm 84 81 30 90 Other
