The Department of Defense, through the Defense Logistics Agency, is seeking to procure valve assemblies and other replacement parts, specifically NSN 7H-4820-015732063, with a quantity of 4 each. The procurement is limited to a single source, Sargent Aerospace & Defense LLC, due to the government's determination that it is uneconomical to acquire the data or rights necessary for alternative sourcing. These valve assemblies are critical components in various defense applications, and the government intends to solicit and negotiate exclusively with the approved supplier. Interested parties may submit their interest and capability statements within 45 days of this notice, and inquiries can be directed to Jennifer Elliott at jennifer.elliott@dla.mil.