The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 37 units of a flight-critical pressure valve (NSN 7R-4820-014552589-QE, REF NR 3920061-111). This procurement requires engineering source approval due to the unique design capabilities and manufacturing knowledge necessary to maintain the quality of the part, which must be sourced from previously approved suppliers. Interested parties must submit their proposals along with the required source approval documentation within 45 days of this presolicitation notice, and any proposals lacking the necessary information will not be considered. For further inquiries, potential bidders can contact Jose Montes at (215) 697-2558 or via email at JOSE.F.MONTES@NAVY.MIL.