Thor 28Z water valve identification

[crawfordtim]

In the picture I have labeled the water valves found under the rear bed storage area. I have tried to guess what some of the valves are for:

A City water on/off???
B ???
C ???
D One way valve to prevent city water connection from filling tank???
E Gravity fill on/off???
F Just an extra connection point???

Middle of winter here unable to test these valves till spring. Hoping someone with a 28Z will know for sure purpose of valves and if they are open or closed for normal operation.

Thank you

[jgtyler]

A is the main shut off from the on board tank during winterization
B & C are lower water drain valves
D looks like the water filter/screen
E is on board tank drain valve
F port to add anti-freeze during winterization

[Mr Sunshine]

Call Thor with your VIN and request a schematic of the plumbing. While you are at it, ask for the 12volt and AC wiring schematics, too. This might solve this mystery and more in the future.