I have a 2008 Fleetwood Tioga 31M. Under the kitchen sink, there is a small lever to the right that says it is for "bypass." I don't know what it is for. Can a Tioga owner can tell me? Thx.
No, it is not behind the hot water heater. It is affixed to the wall under the sink. You can see if when you open the right side of the double doors of the sink cabinet.