Is there a water heater bypass on a 2020 1808fbs? If there is, where could it be? I just bought this and I don’t see any bypass hose behind the heater. I thought all water heaters had them? I don’t see anything in the manual I have. I read somewhere if a water heater doesn’t have a bypass, you have to fill it with rv antifreeze to winterize. That doesn’t sound right to me, that’d be 7-8 gallons to winterize the camper.