There is definitely something wrong with three of the four I received. When gluing the PVC pipe I had no problems with primer and glue. Whenever I glued this bulkhead, the glue never held. The inside of the bulkhead looked like mush. After 5 minutes, when I was no longer holding it in place, I could easily twist it or even apply some pressure to separate the joint. After careful inspection, the glue on the pipe (inner layer), not the outer layer, was hard and the outer layer was soft or something. All the glue on the bulkhead was soft. I don't understand how one worked and the other 3 didn't. These bulkheads are not PVC, they look like ABS and take a lot longer to dry. Unfortunately I tried this 3 times with different glue only to make the hole too big to hold the PVC pipe. Never had this problem in 30 years of PVC bonding. I edited this review after taking the time to research the issue.
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