Dual Gray Tank Drainage

[Cjohnson]

My 327M has dual gray tanks, each with a dump valve. As we don't have any washer hooked up, I'm trying to figure out how the rear tanks fills faster than the front tank from kitchen/bath. I can only assume that the shower/bath drain to the rear tank and that the kitchen sink drains to the front. Are the two tanks plumbed together?

[ba3jbrown]

Our 328G has kitchen and Washer(not installed) tied to rear tank. Front grey is only shower and bathroom sink. They are only tied together at drain point and the rear tank sits lower in frame than front grey. I suppose you could get a little transfer if both grey valves were open and you had the cap on tank drain. Also our panel label is wrong as others have stated. Our Black 2 is the rear grey. If you have a rear toilet check to see if its fully closed.