We have an Elkridge 29RKSA and our #2 grey tank does not have a valve although it has a drain. When we open the drain, the kitchen sink water pours out- the valve for the other grey tank does not control it. We thought that when we drained the #1 grey tank, it would also drain the #2 tank but that is not the case. Is there something we are missing like a second grey water valve? Does anyone else have this problem?