I have a bulkhead on the bottom of a used 50g tank that I'm turning into a sump. The bulkhead is siliconed into place. Of course a standard PVC
cap is a little tight and I can only give it a full turn. It won't come off, but obviously it's not water tight. If I use pvc
cement on the threads, should that be enough to seal it water tight? I'm concerned because I can't turn the cap very much...doesn't seem very tight.
Should I use teflon AND cement? Anyone ever have to do this or have a better solution?