The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of a regulating valve (NSN 7R-4810-013539209-GF) with a quantity of 324 units. This procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that only approved sources may submit proposals, as the technical data available does not support full and open competition. Interested parties must provide comprehensive documentation to demonstrate their qualifications and experience, as outlined in the NAVSUP Source Approval Information Brochures, and must submit their proposals within 45 days of the notice. For further inquiries, potential bidders can contact Jose Montes at (215) 697-2558 or via email at JOSE.F.MONTES@NAVY.MIL.