Ok I need some help. I have a carefree waterway sand filter with the multiport valve. A month ago it came unseated. The o ring did not look worn so I placed it back in using some lube. For a few days all was fine and then it came unseated again. So I bought a new o ring and since then the o ring comes unseated every couple of days! I had read about where some require glue? I'm down to this being my only option. Should I superglue it? Is there another problem I might be missing that could cause this? Otherwise it seems to work fine. Any help would be appreciated.