The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of three units of a flight-critical linear valve, identified by NSN 7R-1650-008686600-EK and reference number HP907100-3. This procurement requires engineering source approval due to the unique design capabilities and manufacturing knowledge necessary to maintain the quality of the part, which is essential for aircraft hydraulic systems. Interested vendors must be approved sources or provide detailed technical data and qualifications for consideration, as the government intends to negotiate with only one source under FAR 6.302-1. Proposals must be submitted within 45 days of this notice, and inquiries can be directed to Danielle Diciacco at (215) 697-5970 or via email at DANIELLE.DICIACCO.CIV@US.NAVY.MIL.