Originally Posted by Evereddie
Look up Flush King. Believe me it's exactly what you need. Again, it attaches to your outlet and back fills your tank. This is the outlet where you attach your stinky slinky when you dump.
Your right. Sorry about that. I was thinking of something else.
That might just work out fine. Now all we need to do is find a hose meter so we can know how many gallons we pump up into the tank when the top is closed. Would not want to overfill it and have it blow into the pop up. YUCK!.