At One Click Purchasing, we are your reliable source for the NSN part 5377-21 manufactured by Eaton Aerospace Ltd. We carry a wide range of popular NSN items on our website, including Piston Valve like part number 5377-21 which is listed with the NSN 4810012993818 for easy identification. If you are interested in 5377-21 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.