I have just recently bought a rally 490 4l
I am very new to this, this is my first caravan & I can't find that yellow water valve that you close & open to fill & empty the water. Advice would be most welcome. Phil
do you know where your water heater is? it will be right next to that, or go under the caravan an you will see a small diameter pipe drop down, the valve is above that
As Marg6 says, your best bet is to start underneath and then look above the drain pipe.
The designers of my Ace have very carefully hidden the valve behind a bed support and you would have no chance of spotting it from above!!
To be fair I suppose it is unlikely to be accidentally knocked there.
DaveS1