Yea their customer service isn't what it should be. I emailed them twice before I purchased all the plumbing for the manifold to see what size I would need to connect to the tank. They didn't even reply with my work hours I can never get ahold of anyone on the phone for support.I told redsea to forget it because they gave me and my lfs a problem about this. So i was litterally gunna ditch the ato all together and just hookup the tunze.