Where is the 2nd black tank valve?
I am the new owner of a 2014 Montana 305RL. The 'systems monitor' panel indicates 2 black and 2 grey tanks. However I can only find 3 valves - 2 grey and 1 black. Per the monitor one of the black tanks is full. How do I drain that?
Isn't there suppose to be 1 valve per tank?
Thanks
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