This notice is for the procurement of 8 units of NSN 7R-6350-014347603-KB, a flight-critical item requiring Government source approval prior to award, with delivery on an FOB origin basis. Only previously approved sources are being solicited, and new sources must submit the technical documentation detailed in the NAVSUP WSS Source Approval Information Brochure with their proposal. Offers that fail to provide all required source approval data will not be considered for award, and the Government may continue with the requirement based on Fleet support needs if approval cannot be processed in time. The Government intends to solicit and negotiate with only one source under FAR 6.302-1, though all responsible sources may express interest or submit proposals for consideration of a competitive procurement. Award will only be made to an offeror or manufacturer that meets the qualification requirements at the time of award, and the acquisition may be subject to Free Trade Agreements.