NASA's Glenn Research Center is seeking to procure a helium liquefier/refrigerator system to support its space propulsion and cryogenic research and development activities. The system must meet specific technical requirements, including a liquefaction capacity of no less than 6.8 g/s, the ability to operate with and without liquid nitrogen pre-cooling, and compliance with various mechanical and electrical design standards. This procurement is critical for advancing NASA's capabilities in cryogenic applications, and the agency intends to issue a sole source contract to Linde Inc. Interested organizations are invited to submit their capabilities and qualifications to Ashlee Shaw via email by 5:00 PM EDT on January 29, 2025, for consideration in a potential competitive acquisition process.