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On a new unit your gauge should be accurate, so figure that you are definitely 3/4 full. The valves in the convenience center are for draining the water lines, not the holding tank.
The drain for the fresh water holding tank will protrude (about once inch) through the plastic underbelly to the rear of the RV, mine has a cap that is colored white.
If you are in the process of winterizing, just draining the lines and tank will not protect you.
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