According to Jayco Manual
3.Open the “fresh tank drain” valve. All fresh water tanks can be drained by one of two types of drain valves. A white plastic drain is attached to the exterior wall or a valve located inside the RV adjacent to the water tank (turn 45° to open or close).
4.Open the “low point drains” by turning, then pulling the handles up. They are installed at the lowest point of the water lines. A label is placed on the outside of the RV to indicate where the drains are located.
The drains will need to be operated from inside the RV.
Once the label is found on the exterior sidewall, the drains will be found at a corresponding location in the interior
Scavenger hunt!
Good luck.