[Porchdog]

It looks like there was a lengthwise rub or crack to kick off the failure, then the crack followed the wrap. You might want to look for what could have caused the initial damage.

Since it is low pressure a repair might hold. You have enough access to the inside to finish it nice and smooth.

I would probably make up a piece to match the id, use that and a layer of wax paper to push JB weld through the crack from the inside (to get a nice, smooth ID), Then a couple layers of glass on the OD. then a couple of band clamps over the repair.