At One Click Purchasing, we are your reliable source for the NSN part 639589 manufactured by The Walworth Company. We carry a wide range of popular NSN items on our website, including Seat Valve like part number 639589 which is listed with the NSN 4820014212566 for easy identification. If you are interested in 639589 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.