Another solution:
You can have a MEASURED portion in your toilet. Pressurized water and timing not needed. Overfill not possible.
Add a (male) hose connection to a water jug. Connect a short hose between Flush King and jug. Lift jug above toilet level and open Flush King valve.
If your jug is less than the 6-8 gallons to fill the toilet+hose+pipe then just repeat X times. (Smaller jugs are lighter).
Of course you will want to test first with TM opened to see the bowl level and mark your jug level for the final fill with a permanent marker.
It looks like you could pour soap (or nice smelling stuff) into Flush King hose connector (after dumping toilet) which will take it up into toilet when adding the fresh water.
If you are done camping then the jugs of clean water could be filled from the TM drains using your leftover water.
EDIT- Here is way to NOT bother with modifying the jug.:
Many jugs have a valve attached and a small spout. You could just set your jug on top of the closed camper.
Then connect one end of hose to Flush King and simply hold the other end of the hose under the jug spout.
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