The little stopper in the skimmer that prevents the weir door from opening into the pool is about to come off. I searched some threads, and it looks like people have had success with Loctite marine adhesive. However, I was curious if anyone knows if these are made of PVC. If so, it would seem that PVC cement with a clear primer might do an even better job, since it essentially melts/welds the pvc to itself. Thoughts?