40' Alpine W/C drain clogging to black tank

[Trainstop2]

We have a 2003 FDTS40 Alpine. The W/C abs train to the black water holding tank has a 3" drain that has an approximate 2" offset "S" bend into the tank that appears to stop only 2-3" above the bottom of the tank. The paper clogs here very easily.
Does anyone know if the lower end of the 3" "S" can be cut off?? It appears to be inside the tank. ie, below the top of the tank.
Is there another solution to the problem?
NOTE:
The "S" was required by the rear side of the holding tank being located slightly forward of the W/C drain location and it is apparently from the factory.

Any and all suggestions are welcomed.

[RV Wizard]

The drain pipe needs to stop at the bottom of the fitting on the top of the tank. Sould like a rubber grommet style fitting and too much pipe has been pushed into the tank. Correcting this install should correct the tissue clogging problem. Good luck and keep us posted.

[Trainstop2]

Thanks RV Wizard:
I have a problem making sure where the top of the tank is. I have used a swivel head mirror on a flex shaft to try and look around the edge but can't see.

I figured that I could use a flex shaft chuck with a small disk cutter and cut around the pipe from the inside....

BUT>>> We leave Tuesday fo a 10 day trip and didn't want to take chance that couldn't be fixed quickly!

When we get back maybe I can cut about 1/2 way up on my guesstimate measurement and the get a "U" wire around it to remeasure up to the tank?
NOT the easiest to get into to repair.
Thanks
Trainstop2

[Rich and Cork]

Why don't you move your question over to the Alpine Forum. Someone there may be able to help. On my Alpine it is a straight drop into the tank.