How to switch which Gray Tank is draining? (Semi Urgent)
My mother and I own a Keystone Challanger fifth wheel. We've been living in it for several months due to our house burning down. All has been well until our kitchen sink refused to drain.
My initial conclusion was that it was clogged. So we plunged it to no avail then we tried rv safe drain cleaner which never went down. Our sink is now filled with about 3 inches of water on both sides.
My mom suggested that the tank was full, but no water drained when I opened the tank. However, when I checked the tanks it said Gray 1 was empty and Gray 2 was full. I always assumed both drained when we opened the tank but it seems like Gray 2 had NEVER been drained and was finally overflowing.
I checked for a valve to switch between the tanks but there was none. Only one valve for Gray and one valve for Black. How do you switch which tank to drain? We've been dealing with this issue for two days now and I'm desperate for an answer...
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