HAMILTON STANDARD ED724401-3 Cabin Pressure Controller Lockheed control no. Pre owned great condition/ Untested/ Could be from Lockheed air craft because it has a Lockheed control number We are wholesaler/liquidators. We bought this in a lot of used items to resell. We were told that it is working, but as we do not have the ability to test it, we are listing this AS-IS for parts. Our knowledge of this item is very limited. We are counting upon you to know what you are buying and if this item will suit your needs. There are NO returns accepted for this item. Purchase at your own discretion. We have been honest with you, so no hassles. Please only purchase this if you agree to those terms. *** PLEASE NOTE! Our store buys and sells a variety of new and used electronics, instruments, tools, antiques and many other items. We do our absolute best to thoroughly test all our merchandise and accurately describe and depict any flaw or defect we find. Unfortunately, we do come across items that are outside of our wheelhouse where we cannot properly test them. These items we list AS-IS for parts. It does not mean that they don't work, just that we cannot test them. SHELF:26 SA