Re: how water bypass on passport 3220
If you don't have a valve at the convenience center (where you hook up fresh water hose) then it will be behind the water heater. Quite often it means removing a drawer or panel. Panels use a #2 square (Roberts) head.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.