The government seeks a source-controlled air-to-air heat exchanger, NSN 1660013177913, quantity 2 EA, from approved source 70210 2340268-3-2. Delivery is required to DLA Distribution San Diego within 178 days after date of order. The item must meet the requirements of the cited drawing. An RFQ will be available electronically via the provided link, and hard copies are not available; digitized drawings and military specifications/standards may be retrieved or ordered electronically. All responsible sources may submit quotes electronically.