At One Click Purchasing, we are your reliable source for the NSN part A31-139 manufactured by Dresser Industries Inc. We carry a wide range of popular NSN items on our website, including Seal Plain Encased like part number A31-139 which is listed with the NSN 5330002921612 for easy identification. If you are interested in A31-139 item, then take the advantage of our online RFQ service, or peruse our website as you see fit to find other items of interest that you may wish to learn more about.