Thanks for all your input. So there is no bypass valve. And for safety reasons I think I will go with my 7 gallons of RV antifreeze.
Happy RVing.
Air7111

Time is coming to winterize the unit. I have done Trailers and bigger motor homes but they all had bypass valves at the hot water tank. In my 1997 B-Van I cannot find these.
Does this mean I have to pour about 7 gal. of RV-Antifreese into the system to be sure everything is filled ?
Air7111

I have 1997 and it weighed 1,760 lbs on the fronts and 2,650 lbs on the rears,
total 8,820 lbs. I do not now though what I had in the tanks so a total weight of
9,000 lbs is absolutely realistic.
Air7111