Mil T, I'm new to the forum. Great post on the way the 4x4 vacuum system. I can't see the pics of your fix with the 1/4 " copper and silicone sheathing. My question is, is there just 1 vacuum line that goes to each actuator and then the other half of that vacuum connector is just a release vent tube? You mentioned routing one tube and terminating it to a dryer, cleaner location. That end stays open all the time?