I have a split gas line with no check valves, and I have a question about when I have to switch out a keg. When I had only one keg, I would seat the lid by hitting it right away with 30 psi and then drop it back down to 10 or so to 'set and forget'. With my dual set up, do I need to unhook both kegs when I do this, or can I leave the one still hooked up? How will that affect that keg that is still hooked up? Also, if I do unhook both, will the gas disconnect seal the line while I seat the lid of my new keg or do I need to worry about doing that some other way?