THRUST BEARINGS WHICH IS PART OF A VALVE TO ALLOW FREE ROTATION OF VAL VE STEM. MADE FROM STEEL AND IS USED IN OIL AND GAS WELLHEAD EQUIPMENT .

GIR1. TERMS OF HEADING 84.81 COVERS TAPS, COCKS, VALVES AND SIMILAR AP PLIANCES FOR PIPES, BOILER SHELLS, TANKS, VATS OR THE LIKE, INCLUDING PRESSURE-REDUCING VALVES AND THERMOSTATICALLY CONTROLLED VALVES. TERMS OF ONE-DASH SUBHEADING 8481.90,. PARTS. TERMS OF TWO-DASH SUBHEADING 848190.00. 90, OTHER THAN FOR USE IN CIVIL AIRCRAFT.