The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 200 units of a flight-critical valve, identified by NSN 7R-4810-015919739-GF. This procurement requires engineering source approval from the design control activity to ensure the quality and reliability of the part, as the item is essential for military applications and must be acquired from approved sources due to the unique design capabilities and technical data rights held by these sources. Interested vendors must submit their proposals along with the necessary source approval documentation within 45 days of this presolicitation notice, and any inquiries should be directed to Arianna G. Pilla at (215) 697-2198 or via email at ariana.pilla@navy.mil.