Jabsco Sensor Max pump

[Manateeman]

Fresh water model 31755. Works fine except the “O Rings” where the strainer and outlet barbs enter the pump. The pressure side leaks on and off. Cleaned the pump head and put in a new barb which has a new o ring. Worked for a few months. I threw away the old barb before measuring the grove, the pump and the o ring so I don’t know if a slightly larger o ring will improve things.
I’d glue it in but I’m not sure with what. 5200?

Suggestions?
Mark