Pentair CC100 Coupler Leaking

[MGA]

I have a Pentair CC 100 filter body and discovered a leak where the 2 inch PVC goes into a coupler on the return side of the filter
I tried tightening it but only make it leak more
I have not taken it apart but I believe there is an o-ring in there and I realized after tightening it by strap wrench it needed to be hand tightened (according to a video I watch on YouTube)
I an assuming may have distorted the o-ring by over tightening it
Its a Pentair black coupler I guess thats glued to the 2 inch PVC
But all the Pentair illustrations do not show exactly what I looking at
If I could figure out what I am looking at
I am sure I could fix it
Maybe I screwed up the o-ring is what I am thinking or cracked the coupler nut by over tightening
Is someone could give me some insight into the coupler steup it would helpful
Thanks
Mike

 

[MGA]

Any sugestions

 

[ajw22]

Get a new O-ring, coat it with Pool Lube - Further Reading, and hand tighten the union and see if it fixes the leak.

 

[ajw22]

 

[MGA]

Thanks I do that thanks for part #
Took it apart this morning cleaned it put back together and it leaked
I guess the o-ring is no good it must have shrunk
Ordering now
Get back in touch after I put it n
Thx again

 

[ajw22]

You put pool lube on the o-ring?

 

[MGA]

Yes I use Super lube for orings
Ordered oring from amazon will get it tomorrow
Hopefully it will work just I hope I did not crack the Pentair Filter Body when I over tightened it!
We’ll see!
I should researched it first and found out it gets hand tightened my mistake!

 

[MGA]

Got gasket
seated it correcty
Covered o-ring and the threads on the coupling in Super Lube
Hand tightened
Still leaked a little bit
Took a piece of wood and soft blow hammer put it on the ridged part of coupling and hit a couple times to tightened it (a little more than handtight)to stop it from leaking
Thank you for all the info provided!