Seems those bypass valves can be anywhere! On our old 2009 Wilderness, the valves were right by the water pump under the closet mid way in the trailer behind a panel. On our new 2015 Wildcat, they are under the sink, again behind a panel, and attached to the hot water tank. In our older 1999, Tahoe 5th wheel they're just next to the hot water tank under the sink, no panel, just there. At least in the 2015, the pipes are red and blue color coded!