The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of two air modulation valves (NSN 7R-1660-012027136-VH, REF NR 737047-4). This procurement is critical as the item is flight critical and requires Government source approval prior to contract award, with the intent to solicit and negotiate with only one approved source due to the unavailability of adequate specifications for competitive solicitation. Interested parties must submit the necessary documentation for source approval along with their proposals, as offers lacking required data will not be considered. For further inquiries, potential bidders can contact Gina P. Sassane at (215) 697-2198 or via email at GINA.P.SASSANE.CIV@US.NAVY.MIL, with proposals due within 45 days of the notice publication.