A trick I learned at one of the Rallys is to purchase a portable T handle for the dump pipe exit and attach where you attach the hose. I then close the T handle and open the shower gray tank valve and the galley tank valve. That allows both those tanks to equalize. I only do this if we don't have FHU. We never would fill the galley tank but the shower tank would always fill first. This allows you to utilize both tanks to capacity. When I dump I close both of the gray tank valve then open the black tank, flush till I have clear water running then dump the gray tanks.
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