The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of 22 units of filter elements and similar replacement parts, identified by NSN 1R-2940-016962144-SX and reference number 190618-160. This procurement requires government source approval prior to contract award due to the flight-critical nature of the item, and only previously approved sources will be considered for this solicitation. Interested vendors must submit detailed technical data and experience documentation as outlined in the NAVSUP WSS Source Approval Information Brochures, with proposals due to the primary contact, Connor C. Lewis, at CONNOR.C.LEWIS@NAVY.MIL. The delivery terms are FOB origin, and the timeline for source approval may affect the award process based on fleet support needs.