That procedure is great if you can get to the water heater bypass valve. However, GS installed mine over the fresh water tank, behind a set of drawers in the master bedroom. I have to disassemble the drawers to get to in.
Like I said in my winterizing, we are lucky to be in a climate that does not get that cold. So far, my procedure has worked flawlessly without having to disassemble the coach to perform.
I might add that I use my winterizing technique three to four times each winter because we use the coach to go to Arizona to see the kids. I winterize after each trip.
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2008 SuperNova (6331)
2011 Jeep Wrangler (Toad)
Now: 2011 Winnebago Journey Express
2011 Silverado 4x4 Texas Edition Extended Cab (Toad)
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