I have a similar issue. I used a 3 inch core drill and drilled new holes through 8 inch block wall. Through this hole I put 2 inch pvc pipe with a coupling that has a female threaded end which projects about 1/4 inch into pool. There is a gap less than 1/4 inch around the PVC which I need to fill to make pool watertight. I also want to fill the entire cavity all the way to the back if possible. I bought some SIkabond construction adhesive to fill the back part of the cavity all the way to about 1 inch from the front. I then want to use Sikaflex 1A to complete filling in the space almost to the finished pool diamond brite. Last, I plan to finish the last 1/4 inch of space with diamondbrite which will finish flush with existing pool wall. I did not want to use the Sikaflex for the entire depth because it says that I should not use for depths greater than 1 inch.
I plan to screw in the jets to this female threaded end. Will this method work or can someone suggest a better method? I did not want to use hydrolic cement as I felt it would be hard to push it deep into the gap all the way to the back.
Thanks,
CaryR