I've got two different ones - a Coleman unit and another made by another company that installs inside the wash select. I think carolina pride and American makes one (or did)Make sure you get one that forces the customer to push a button for the vac token. I'd say only 2/3rds of the customers want a vac token.
Both units are triggered by the wash relays. The downside to this is that the token (or option to get one) is delayed until the inhibit signal goes away.
