The top of the tank coupler was 1/1/2" ABS, the vent pipe is 1 1/2" ABS
can't see how it was attached to the tank or what it looked like.
The coupler in the tank was out of line with the vent pipe by about 2"
The vent pipe had to be forced over to get it in the coupler, I wish I had cut some off and used a couple 45 degree ells, if it pops out again that is what I will do.
Someone at Jayco put the coupler in the wrong place ( or the vent stack )
I don't believe the pipe can go anywhere now as the whole cavity is filled with foam.
Working on the sock problem ( don't have to wear the dang things here in Hawaii)
Aloha Leon