NASA's Glenn Research Center is seeking information from potential sources for the development of helium liquefiers/refrigerators to support space propulsion and cryogenic research activities. The procurement aims to identify capable vendors who can provide systems that meet specific technical requirements, including advanced gas-bearing helium turbo-expanders, operational capacities, and compliance with various engineering standards. This initiative is crucial for NASA's ongoing efforts in cryogenic technology, which plays a significant role in space exploration and propulsion systems. Interested parties are invited to submit their capability statements and relevant documentation to Ashlee Shaw at ashlee.b.shaw@nasa.gov by 5:00 PM ET on January 10, 2025, as no solicitation currently exists.