This is a sources sought / market research notice for the new manufacture procurement of a Valve Assembly (NSN 1660-00-626-5443, P/N 104894) for the KC-135 platform, with an estimated spares requirement of 123 units. Interested sources must be capable of providing all labor, materials, inspection, testing, preservation, packaging, and shipping, and may also handle supply chain management and nonrecurring engineering costs. The place of performance is Tinker AFB, Oklahoma. No solicitation is currently available, and this notice is not a request for proposal; interested parties must register as interested vendors to participate. The government will use responses to determine the acquisition strategy, including potential small business set-aside, and encourages all business types to respond.