2005 Gulfstream Ultra SE - Need winterizing help

[sagebrushkate]

We drained the tanks and water lines and water heater and got to the point where we began siphoning the pink antifreeze fluid through the lines via the water pump. All the pink fluid poured out of the water heater. Does anyone know what valve we have to close off and WHERE TO FIND IT in this model? The manifold under the sink has a lever but turning it in line with the manifold body shuts off flow to the hot water lines and turning it perpendicular to the manifold body shuts off flow to the cold lines, but turning it either way still does not stop the antifreeze from coming out of the water heater.

Any help would be greatly appreciated. And if your help is that the bypass valve on the water heater is usually behind the water heater then that doesn't help me as our water heater is accessed by an exterior panel and there is no access to the back of it from the interior of the coach.

Thanks in advance,
Sagebrush Kate