The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of gate valves, identified by NSN 7R-4810-015819450-V2, with a quantity of 23 units required. This procurement is critical as the item is flight critical, necessitating government source approval prior to contract award, and only previously approved sources will be solicited. Interested parties must provide comprehensive documentation as outlined in the NAVSUP Source Approval Information Brochures, and proposals must be submitted within 45 days of this notice, with contact for inquiries directed to Jacob A. Tarini at jacob.tarlini@navy.mil or by phone at (215) 697-3563.