I'm not quite sure yet. I usually leave before workers show up and the plumbers were gone before I made it home that day. I haven't had a chance to follow up with my PM, but I'll ask him about those open pipes this week. The electricians just wired up in the blower for the spa today, but didn't plumb it in. I'm not sure where that usually ties into the system.You have been busy. Are the open pipes for the ozone system?