I'm not sure about the exact fit between the 4" PVC & the 4" corrugated
plastic
but this will probably work
http://www.stant.com/no-hub/index.cfm
you will have to put somthing inside the corrugated plastic to support
the clamping load
maybe youu can get the corrugated plastic to go over the PVC
soe sort of flexible sea, natural rubber, silicone, urethane seal is
better than epoxy (to rigid)
cheers
Bob