Originally Posted by email@example.com
Yeah that's is what I thought, however I neglected to mention in my original post that after draining the waste water and the low point drain my gray water tank still shows 2/3 full. I have crawled all underneath and couldn't locate another valve. Everything is sealed so I'm assuming I will need to remove some of that to see how it is piped. This does not look like fun though. Does anyone know about where that valve should be?
The low point drain on my rig drains the water in the fresh lines.
There should be two t-handles, one for the black tank and one for the grey. It is possible that one of the t-handles has snapped off, the shaft is made of an aluminum tube. I have had a couple snap off from road debris.
Look for a hole in the belly pan about 3/8-1/2", the grey valve could be just above.