National Stock Number: 4820-00-790-1781
  Federal Supply Class: 4820
  National Item Identification Number: 007901781
  Description: DISK,VALVE
  Detail: An item of various shapes (usually circular, conical, cylindrical, or rectangular) used to prevent or regulate the flow of liquids or gases through the valve. May include a retainer, screw, holder, and the like. 
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