At One Click Purchasing, we are your reliable source for the NSN part 5566 manufactured by Howell Laboratories Inc. We carry a wide range of popular NSN items on our website, including Spacer Ring like part number 5566 which is listed with the NSN 5365013065894 for easy identification. If you are interested in 5566 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.