Look under the coach below the fresh water fill sprout. You will see a tube coming through the floor. There may be a drain valve on the tube. If not, you will need to access the area where the fresh water tank is located inside your coach.
On my Axis the drain valve is located inside the coach next to the fresh water tank and is accessed by removing a panel.
There will be two drains, one for the cold water and the other for the hot water side. These are the low point drains.
Hopes this points you in the right direction.
Bruce
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