If you have a Whale or Truma type filler on your van and for any reason it goes faulty then without a filler cap into the tank can make it tricky to fill the fresh water tank.
If like mine you have a drain tap then there is a solution with the use of a hose tap adapter you can fill the tank through this.
When the tank is full it comes out the overflow so you know when to cut the supply – check you have an overflow that discharges under the van.
In fact this is quite a convenient way to fill the tank when filling at home prior for your travels.
My Motorhome Mods .Online 