The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 20 units of the STACK VALVE ASSEMBLY, identified by NSN 7R-1720-011569285-EY. 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 capability and experience in producing similar items, with a deadline for proposals set at 45 days from the notice publication date. For further inquiries, Alexis K. Healy can be contacted at (215) 697-1143 or via email at ALEXIS.HEALY@NAVY.MIL.