City water at the top and water to fill your tank on the bottom is the way I read it. On the bottom of your RV is a fresh water tank drain. Open the drain and hook up the hose to one of those fittings. Then you'll know for sure.
Jim and DW 50 years Brenda
2017 40rssa, also a 2015 Salem (for Alaska)
2019 F450, ruby red
Harley Road King & sidecar