If we've got you confused now, some RV's have two valves, one to the FW tank and one to the anti-freeze hookup. But some RV's have a single 3-way valve that goes to the tank in one direction and the anti-freeze hookup in the other direction.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10