At One Click Purchasing, we are your reliable source for the NSN part 1220-0021 manufactured by Signet Scientific Co. We carry a wide range of popular NSN items on our website, including O Ring like part number 1220-0021 which is listed with the NSN 5331014189715 for easy identification. If you are interested in 1220-0021 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.