The Department of Defense, through the Defense Logistics Agency (DLA Aviation), is seeking proposals for the procurement of 20 units of the NSN 4920015258100 ENVELOPE, ENGINE, AIR. This solicitation may lead to an Indefinite Delivery Contract (IDC) with a one-year term or until the total orders reach $350,000, with an estimated four orders per year and a guaranteed minimum quantity of two. The items are critical for maintenance and repair operations and will be shipped to various DLA depots both within the continental United States (CONUS) and outside (OCONUS). Interested vendors must submit their quotes electronically, and any inquiries should be directed to the buyer via email at DibbsBSM@dla.mil, with the solicitation available online at the DLA's DIBBS website.