I was able to find out that my model has only 1 valve, but there is apparently an automatic valve of some sort somewhere among the water heater connections that is supposed to complete the bypass. However, it's not reliable and is known, to Forest River and to RV techs, to jam and not prevent antifreeze from filling the water heater. I flushed the tank completely, but we'll see if it fills up again when I de-winterize. I think I'll store it down South come next October!
2007 Georgetown 378
2011 Cadillac SRX toad
Only downside to travelling is missing the grandkids!