This is a Request for Information (RFI) for planning purposes only and does not constitute a formal solicitation or commitment to contract. The Air Force Life Cycle Management Center at Joint Base San Antonio - Lackland, Texas, is seeking information regarding the potential purchase of 300 Circle Seal brand check valves (Part Number 259A-1PP-.15) for cryogenic rectifier systems. The government will not reimburse any costs associated with responding, and a response is voluntary and will not affect a company's ability to bid on any future solicitation. No contract will be awarded based on this RFI.