This unrestricted acquisition is for a commercial, Air Force critical safety item (Valve, Check) under a Firm-Fixed Price Indefinite Delivery Contract with a 3-year base period and two 1-year options. The estimated annual demand quantity is 117 units, and the item requires Non-Destructive Testing (NDT) accreditation; Certificate of Conformance is not authorized without ESA approval. Delivery is required within 120 days after issuance of each delivery order, with no deliveries before the order is placed. FOB is origin, and shipping instructions will be provided with individual delivery orders. Offers will be evaluated on price, delivery, and performance, and all interested parties may submit offers.