The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 56 units of a flight-critical valve component, identified by NSN 7R-4810-016000375-LC. This opportunity requires that all potential suppliers be previously approved by the Government due to the technical data limitations and the critical nature of the item, which cannot be reverse-engineered or sourced from unapproved vendors. Interested parties must submit their proposals along with the necessary source approval documentation within 45 days of this presolicitation notice, with the understanding that the Government may proceed with award based on Fleet support needs if new source approvals cannot be processed in time. For further inquiries, interested vendors can contact Arianna G. Pilla at (215) 697-2198 or via email at ARIANNA.PILLA@NAVY.MIL.