The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure 13 units of the 100 W Filter PA, Air, identified by NSN 7R-1680-016108983-E7 and reference number 178000-102. 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 item’s quality is contingent upon the unique design and manufacturing capabilities of these sources. Interested vendors must provide comprehensive documentation as outlined in the NAVSUP Source Approval Information Brochures, and proposals must be submitted within 45 days of this presolicitation notice. For further inquiries, interested parties can contact Kelly A. Gipson at (215) 697-4787 or via email at KELLY.A.GIPSON2.CIV@US.NAVY.MIL.