[airboatart]

Originally Posted by AZ Traveler

Larry,

If you haven't done so add this to where the sewer hose connects to your rig. https://www.amazon.com/Valterra-T58-...s%2C240&sr=8-2

Agree with Montana Man - you may have something stuck in your black tank valve.

I also added this valve to my rig, so now no more surprises when i remove the cap.