Different folks have tried different methods. Some work on the temp basis: JB, 5200, new fitting glued from the inside and out. Best long-term solution if you do not want to keep messing with it - replace.

Matt Brown (SC engineering) was posting on social media recently. Boat drivers are filling ballast bags and using the overflows to signal to the driver the "bags are full" is causing some of the blowout failures on boats.