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Old 02-07-2020, 03:18 PM   #1
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Brand: Thor Motor Coach
Model: 28Z Four Winds 2018
State: Alaska
Posts: 1
THOR #17853
Thor 28Z water valve identification

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
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Old 02-07-2020, 04:40 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 33x
State: Virginia
Posts: 52
THOR #14214
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
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Old 02-09-2020, 01:52 AM   #3
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Brand: Thor Motor Coach
Model: 2016 Vegas 25.2
State: Florida
Posts: 2,222
THOR #1589
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.
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