Peter,
We added a gate valve where you hook up the sewer hose. It just twists on like the sewer hose does.
(then hook the sewer hose to it).
By keeping it closed, & open both galley & Grey water valves it essentially gives you one 76 gallon tank.
Should you need more volume for say, the shower instead of the kitchen sink.
You would only need it if you were dry camping.
Glad it was a easy fix.
J&D
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