Holding tank vent

[Sailmonkey]

That tank looks aluminum!! I’d pull it now and replumb the whole mess in plastic.

Now while it still in containing waste without holes.

[meirriba]

Originally Posted by kcj

In the process of redoing plumbing on a 2003 lagoon cat...I have come to find the holding tank vent fitting appears to have a dip tube to the bottom of the tank.

This Does not make sense to me...what is the logic? Or Should I try to remove the tube?

Thanks in advance.
Cheers
John

It is the pump-out hose...