Apollo Command Service Module NASA valve assembly for Nitrogen Tetroxide. Assembly measures approximately 16 x 13.5, with a stenciled identification of “Valve Assembly, Nitrogen Tetroxide,” “Serial No. OS275NTV6080,” made by Simmons Precision Products of Yorktown, New York. Two of the outputs are covered in old plastic with “Cleaned for Service” labels affixed to both. In fine condition, with several dents. RR Auction COA.