Sewer hose... I recently upgraded to the net Tethford Smart Hose" so far, Now when I first assembled it (The ends are sepeerate) it was a bear to connect, but the 2nd time I put the discharge end on it was easier.
This is a fairly impressive hose..
To store it I got a 5x5 vinyl fence post from Home Depot and attached that (Currently with straps) to the frame rails under the RV... One cap is simply screwed on, on the other end I did some surgery and put the cap on with a hinge and a latch. So far I am happy with it. Works well, easier to wrangle, bit harder to stow, than a Rinoflx.