Finally...a reply! Someone must have been on vacation? LOL.
"The best glue that we have found is an epoxy glue. We have had several calls about this and recommended this product. It is a 2 part glue that is mixed together. Let me know if this does not work."
I thought about calling but went ahead and hit it with some Gorilla Glue since it was closest at hand. Not sure how it will hold up as the PVC cut doesn't make 100% contact with the pottery but good enough for now.