Black tank fitting removal

[chaps2018]

Any of you removed a black tank fitting that was assembled like this? It appears to be a rigid glue material that was used in this 2018 rig. Both black and gray Tanks used the same material/screw clamp assembly method.

No issues, just wondering how to repair if the need should arrive. I notice the repair parts are essentially press fit into a hole in the tank. That won’t work here since the tank has a flange built in.

[Bama Rambler]

That's most likely Dicor caulking (not self-leveling). Once you remove the valve and the band clamp you should be able to run a knife between the adapter and tank neck and get it loose. Once you get it out the caulking will peel off.