Presolicitation notice from the Department of Defense, Department of the Navy, and NAVSUP Weapon Systems Support is seeking to procure 1000 units of NSN 0Q-2810-014736655-CL, a RING, AIRCRAFT MATER. This item is used in gasoline reciprocating engines, aircraft prime mover, and its components. The government requires source approval for this flight critical item before awarding the contract. Only previously approved sources have been solicited. Interested parties must submit the necessary information for source approval. The proposed contract action is intended for a single source under FAR 6.302-1, but all responsible sources can express their interest within 45 days.