At One Click Purchasing, we are your reliable source for the NSN part NM639 manufactured by Tyco Valves And Controls Ltd. We carry a wide range of popular NSN items on our website, including Piston Valve like part number NM639 which is listed with the NSN 4820011726023 for easy identification. If you are interested in NM639 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.