The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 15 units of a hold back fitting (NSN 7R-1720-014551416-QE) as part of a repair/modification initiative. This procurement requires engineering source approval to ensure the quality of the part, as it is flight critical and necessitates acquisition from approved sources due to the unique design capabilities and technical data rights held by these sources. Interested parties must submit their proposals along with the required source approval documentation within 45 days of this presolicitation notice, and any inquiries should be directed to Chad M. Fichter at (215) 697-2782 or via email at CHAD.FICHTER@NAVY.MIL.