At One Click Purchasing, we are your reliable source for the NSN part 21M-159 manufactured by Metrex Valve Corp. We carry a wide range of popular NSN items on our website, including Retainer Seal like part number 21M-159 which is listed with the NSN 5330016323947 for easy identification. If you are interested in 21M-159 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.