The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of hydraulic replacement parts, specifically NSN 0Q-4320-017073709-QH, with a quantity of 4 each. These parts are critical for maintaining the quality and functionality of military equipment, requiring engineering source approval to ensure compliance with design control standards. Interested vendors must provide necessary documentation for source approval, as only previously approved sources will be considered for this flight-critical item. Proposals must be submitted within 45 days of this notice, and inquiries can be directed to Brian T. Kent at (215) 697-0000 or via email at BRIAN.T.KENT.CIV@US.NAVY.MIL.