Hello all. Trying to winterize for the season, and for the life of me, I can't seem to find the water heater bypass valve. My water heater is aft over the axles, but there is seemingly no way to access the backside of the wh. Does it make sense that the valve might be located in the front basement? My goal is to send anti-freeze through the lines, but having a bypass valve so far from the wh would seem ineffective. Anyone happen to have a diagram or knowledge of the system? Appreciate any feedback.