I looked up the manual to your trailer o see if there was anything in there. Unfortunately the manual is onse size fits all and not at all specific.
Keystone manual wrote:
Fresh Water Tank
All Keystone RVs are equipped with a fresh water tank. Tanks vary significantly in size by RV brand & model.
Keystone RV uses 2 different methods to fill the fresh water tank depending on the brand & model.
Gravity Water Fill - Remove the cap, on the exterior connection labeled ”Fresh Water Connection”, and insert the
hose from your water source and turn on the water. While filling the tank, periodically check the monitor panel to
determine the level of water in the tank. When full turn the water source off. If overfilled, water will “spit” back out
of the gravity fill as there is no automatic shutoff. DO NOT leave the RV unattended while filling the fresh water
tank. Overfilling the tank can cause damage to the system components which may not be considered warrantable.
Pressure Water Fill - Hook a potable water supply to the city water fill valve, turn the valves to the tank fill position
and turn on the water supply.
