Our gray water tank seems to be clogged up. The galley part had water coming up through the kitchen sink drain. We just figured the tank was full so when we drained the tanks the water was still in th...
I have a Montana Mountaineer which is very similar to the Cougar. If you have a galley tank then the drain valve is not with the black and gray tank valves. My galley valve is under the camper near the sewer hose connection.