Thank you for explaining this to me. I love being the dumbest person in the room because I can learn so much. I have drums all the way around, so it sounds like I need them. I hooked it up using the combination valve provided. Is it a problem if it's left on so it's less plumbing? That's probably why I only have 2 residual valves, one for the front and one for the back. I could probably leave it as is and add another residual valve to the back couldn't I?
