At One Click Purchasing, we are your reliable source for the NSN part 21243 manufactured by Dover Engineered Systems Inc. We carry a wide range of popular NSN items on our website, including Seat Valve like part number 21243 which is listed with the NSN 4820014148040 for easy identification. If you are interested in 21243 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.