2020Imagine 2500RL Black tank won’t completely empty

[pribons]

I really appreciate the information Thank You both

[TedS]

I used a hose clamp to keep my valve from twisting when disconnecting the hose. The swivel part of my valve is fairly snug and the valve would disconnect before the handle would stop against the trailer. The clamp is just tight enough to create a bit of friction over the pins.