The plastic intake coupling of my pool's dedicated suction line has come loose; as a matter of fact it was never glued when the pool was built. I am referring to the piece that is female-threaded to receive the suction line cover that has the spring-loaded cover. A repairman put epoxy over and under it hoping it would stick, but it didn't work.
What can I use to glue that against the wall surface? Hopefully I can do it without draining water.