garyemunson wrote:
Don't make the mistake of thinking you can now leave the black valve open all the time. As said above, keep it closed and wait until at least 3/4 full before dumping.
Flip side is a septic system can't always take 40-80 gallons of raw sewage all at once. They are designed for constant use, not weekly. Might want to leave the gray open, dump black every 2-5 days.
To the OP, I would simply buy some PVC sewer pipe and plumb it to the inlet. Make the slope at least 1 inch per 10 feet. Run your stinky hose into the other end of that. You can even glue on a screw in just like at the campgrounds.
On edit:
On the end you put the stinky slinky glue up a cleanout, just in case. Any cheap handyman can do all of this.