I need to attach a return line to a underwater pump in my sump. It is a 3/4" outlet and my clear 3/4" flex tubing fits over it tightly (but I doubt I will need to heat it up). I'm not confident that the flex tubing will hold under pressure, especially since there is not a ridge that the flex tubing must be forced over. I would like to avoid spraying the water in my sump all over my room.
What's the best way to make sure that the flex tubing stays on the pump? I would rather not do a "permanent" attachment that cannot be undone, although I would not mind permanently attaching a coupling with male threads on one end. Is there some sort of glue (PVC cement) that holds on to plastic and PVC both? Or perhaps I should use a clamp of some sort -- I have both plastic and metal clamps. The last time I used a metal clamp I really bent the heck out of pump's outlet (and even with the clamp, the connection came apart a couple of times rather easily). Any other ideas?