Pelican has them. Call it a vacuum valve in the search box. It is not expensive. But make sure it's not a simple rubber connector tube. If you look at the catalog picture, you will see the 2 nipples for vacuum and the 2 ears that take the screws into the ignition lock. It's awkward, but doable. I don't think it matters which nipple is in or out. A few months ago I did have a failing vacuum valve that worked in one direction but leaked through in the other. It was trying to shut the engine off as I drove. I reversed the tubes and it worked fine. It took me about a mile to figure that out, though.