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 80 Manually operated gate valves with an internal diameter exceeding 5 cm but not exceed 84 81 80 61 Manually operated gate valves with an internal diameter exceeding 5 cm but not exceed Commodity Code Description 84 81 80 61 00 Manually operated gate valves with an internal diameter exceeding 5 cm but not exceed