OK so I got a new overflow (CPR CS150), and man it makes so much noise, anyone have an idea on how to bring this noise level down, and sorry drilling the tank is not an option.
I cut a piece of styrofoam and placed it tightly in the cpr. Then fold a hand towel and place it over the styrofoam. Exactly what I did to my cpr overflow and its dead silent.
the Bulkhead on the overflow is 1.25" and my old overflow had a standpipe that is 3/4" I just stuck the pipe in the bulkkhead and its kinda fit and it seems to be working perfectly