I have been looking for my air system wet tank. I thought searching online on this forum, I would find it easily. Not so. Most locations appear to be up front near the front and rear brake tanks. Most brake tanks appear to located left and right. Not so on mine. Up front I have two tanks fore and aft center of the front axle. I assume and I know about assumptions that the front tank is for the front brakes and rear tank is for the rear brakes. That will be easy enough to check. No wet tank in sight. My wet tank is identical to the front and rear brake tanks and is located center coach front of the rear axle. The drain is piped over to a drain valve located at the front of the drivers side rear wheels. My build number and model is located in my signature below I may have a one off but from the logical location I would not think so. This post is for FYI and to help anyone searching for the location of their wet tank.
My coach has a decal or paint on the outside telling you where the drain valve is at that location.
Did you look around the rear axle. I would bet that it is somewhere around there. On the drivers side rear axle tire do you have the valve to purge a tank?
The two forward tanks are front and rear brake isolated dry tanks. Follow the line from the drain valve in front of the driver rear wheel inboard to find the wet tank. Probably just above the differential.
[added year to topic title since slide-equipped coaches have an additional tank (smaller diameter) for the slide bladders - moderator Michelle]
I found everything as noted this is just for anyone that cannot find their wet tank. Mine is located in front of the rear axle center of coach and the drain (purge) valve is on the body in front of the drivers side rear wheel. All OK except a major leak that I will post on another topic. Thanks to all.
Major leak. found it by looking for an air line behind the dash. Found two lines (front and rear tanks) and one is a bad leak that I am sure has been causing my issues with the on board compressor running excessively. I will post fix and questions on another topic.
Wet tank is in the back just in front of the rear-end between the frame rails there a drain line on the rear left side driver side wheel well in front of the drive wheels followed the line up to the tank