The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking qualified sources for the repair and modification of a gate valve, identified by NSN 7R-4810-016199186-P8. The procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that only approved sources with the requisite design capability and manufacturing knowledge may participate. Interested parties must submit detailed proposals, including any necessary source approval documentation, within 45 days of this notice, with the primary contact for inquiries being Jessica L. Harpel at jessica.harpel@navy.mil. The contract will be awarded only to those who meet the qualification requirements at the time of award, as outlined in FAR clause 52.209-1.