Hello! We have a 2013 Heritage Glen 272 and our galley tank is full, the kitchen sink is not draining, and our grey tank is empty. We cannot find the valve to empty the tank and would greatly appreciate any help in locating it! Thanks!
Are you sure there is a galley tank ? Earlier model kitchen sinks would just drain into the only grey. Not familiar with your trailer. Maybe behind an exterior access panel or at least near the galley under the driver's/ dump side. Could have a trap or vent issue or a collapsed / kinked drain line if in a slideout. Just blindfulley trying to help. With more info someone familiar may chime in.