is your water system pressurized?  if so you'd need a vacuum breaker and some kind of valve for filling, I've the fresh head on my boat it has a vacuum breaker and you open a normally closed valve to add water and then pump the evacuate.  So I guess the difference id the pump does not bring water in.  If you're still manual and pumping to fill you may just have to separate out this tank from the rest of the boat and this will be solely for flushing the head.  Fresh water flushing does wonders for that dead marine life smell and it is an upgrade well worth doing.  I wonder if raritan makes a retrofit kit to become a freeah head

On 2/12/2019 1:31 PM, David via CnC-List wrote:
Adding a third water tank.   Thought I would plumb in fresh water flush with backflow protection from third tank to conventional head.  Anybody try that?

>From my Android....


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