[Cummins12V98]

The 3" cable valve is replaced with a standard "T" handle valve, it stays open. It's near the water filter. I now use the one added just outside the plastic pan.

The grey tank cable valve is replaced with a "T" valve that is sticking out of the pan in last pic. I had added a "T" valve next to the 3" outside the pan but now it is left open and the "T" handle is now rotated to the back.

This process took place over a couple years.

To do it right simply replace the 1.5" grey tank valve with a "T" handle valve as shown in the last pic.

For the 3" simply leave it open and add the 3" just outside the plastic pan.