The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 8 units of a flight-critical piston valve, identified by NSN 7R-4810-011364330-GF. This procurement requires engineering source approval from the design control activity to ensure the quality of the part, as only previously approved sources will be solicited due to the unique design capabilities and technical data rights retained by these sources. Interested parties must submit their proposals along with the necessary source approval documentation within 45 days of this notice, and any proposals lacking the required information will not be considered. For further inquiries, Patrick J. Kilkenny can be contacted at (215) 697-2560 or via email at PATRICK.J.KILKENNY2.CIV@US.NAVY.MIL.