The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 22 units of the Stack Valve Assembly, identified by NSN 7R-1720-011569285-EY. This procurement is critical as the item is flight critical and requires government source approval prior to contract award, with no suitable technical data or manufacturing knowledge available for alternative sources. Interested parties must be previously approved by the government or submit a comprehensive source approval request along with their proposals, as offers lacking the necessary documentation will not be considered. For further inquiries, Alexis K. Healy can be contacted at (215) 697-1143 or via email at ALEXIS.HEALY@NAVY.MIL, with a proposal submission deadline of 45 days from the notice publication date.