www.thetford.com
click on Parts hold on and select on dropdown menu permanent toilets. select manual and pick your model then select look at the manual and you will see where the water goes.
Most open locker on outside and above the waste tank is a filler tube with cap [black usually] hold cap end and swing the filler out. Remove the cap. Pour in approx half cup of PINK fluid followed by up to 15litres of water. On your right you should see a clear level tube. Priming the waste cassette Now for the Blue stuff waste chemical. MAKE SURE EACH TIME the valve at the bottom of the toilet bowl is CLOSED. or you'll damage the opening mechanism trying to pull out the cassette. press the clip down in front and at base of the cassette. Pull the cassette out and stand it on the ground with the empty tube up. turn the emtpy tube that's the fat tub with a cap remove the cap and pourt approx 2-measures of BLUE aqua kem [level marks on bottle of that aqua kem]. Two things to remember storing for winter last trip drain off the toilet flush by removing the clear level tube or drain tube from the side hold it down untill water has drained. to save grass drain in to bucket then dispose down on site/home toilet. If you also have a carver water heater that also must be drained. Open the drain valve on outside in corner of the vent using a fairly large blade screwdriver. turn on hot taps to speed up draining. Close taps after. Next if you have a crystal filter systeme is to remove the filter let water out then replace filter loose to stop insects making home in the housing. Replace filters at least once a year if not twice. Now I'm telling you all this thinking you are new to caravaning not knowing where the water goes for the toilet flush.
Then again I may be overstepping my mark.
Nobby, September 2008