Ok, But Im not bypassing it at all. I just cannot see a reason for it.
I drain the WH, which is a drain on mine, not the anode rod cap. BTW, I never open anything on the WH without opening the psi relief valve first. So the air will escape from there under control.
Once the WH is drained, I put air in the lines and push any water in the WH intake line into the WH and out the drain.
Then I replace the WH drain plug in and the WH is done.
Next while air is on and pushing, I open up facets, showers, toilet, etc, one at a time. Get all water out, and your done.
Put some pink in the traps and tanks.
IMO the only reason to put WH in bypass is because you dont want the pink in there, or you need to service it, but still need water to the rest of the camper.
Please correct me if Im wrong, but I just dont see a need to use WH bypass to winterize if you arent using the pink?