The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair or modification of butterfly valves, identified by NSN 7R-4810-014707884-KB, with a quantity of 10 units required. This procurement is critical as the items are flight critical and require Government source approval prior to contract award, limiting the solicitation to previously approved sources only. Interested vendors must submit detailed technical data and documentation as outlined in the NAVSUP Source Approval Information Brochures, and proposals must be submitted within 45 days of this notice. For further inquiries, potential bidders can contact Jacob A. Tarini at (215) 697-3563 or via email at JACOB.TARLINI@NAVY.MIL.