Hi folks. I'm brand new to TFP so looking for some advice on a problem I am having with my newly-acquired pool. For whatever reason (I'm not that familiar with prior owner's work), the pool return pipes are smooth 2 inch PVC with no female threading. I'm not sure how to attach two eyeball fittings (appear to be 1.5 inch "knock-in" fittings with no threads) into the return pipes, as once I place them into the pipe and turn on the pool pump system, the pressure simply blows them back out into the pool. The pool company that opened the pool for me for the season suggested I wrap the fitting with some electrical tape to try to jam the fittings into the pipe. That didn't really work well because (1) it made the diameter of the fitting too large to effectively fit into the return pipe, and (2) on the few occasions when I did manage to get the fitting inserted, the tape only worked for about a half hour or so before the pressure pushed the fitting out of the pipe and back into the pool. This is very frustrating as when the fittings pop out, the pressure back into the pool effectively drops and the water is not agitated enough to effectively clean with skimmers, etc.
Any advice on what I should do to get the fittings to stay in the pipe? Do they make a fitting or combination of fittings that would solve this problem? Another thought I had was trying to glue the fitting to the pipe using underwater glue such as Mr. Sticky's or a similar product, but I have never used that before and have no idea if the glue could hold up to the pressure on the fitting from the returning pool water.
Hopefully the great minds on TFP can help me come up with a solution. Thanks in advance.