This notice is for a specific NSN part (quantity 2) requiring Government source approval due to its flight-critical nature and limited technical data. Only previously approved sources are solicited; alternate sources must submit source approval information as detailed in NAVSUP WSS brochures. The Government intends to solicit and negotiate with only one source, but all responsible sources may express interest. Award will only be made if the offeror and product meet qualification requirements at time of award. The procurement is not a commercial item acquisition and may be subject to trade agreements.