The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of four units of a safety relief valve, NSN 7R-4820-015809785-P8, under a presolicitation notice. This procurement involves a commercial/nondevelopmental item that is flight critical, necessitating government source approval prior to contract award, as only previously approved sources will be considered. Interested vendors must provide detailed technical data and documentation to demonstrate their capability to produce the item, as offers lacking the required information will not be considered. For inquiries, interested parties can contact Sara M. Hojnowski at (215) 697-2198 or via email at SARA.HOJNOWSKI@NAVY.MIL, with proposals due within 45 days of the notice publication.