LKONWEE39010200 O-497 Tank Clamp O-Ring Replacement Pool and Spa DE Filter,fit for Pentair (CCP 520/420/320) Clean & Clear Plus and FNS Plus Filters

This was a perfect fit and solved my problem of small leaks and air getting into the system due to the prior Oring inside of the filter. Leslie's wanted 54 dollars for the pentair oring, which is crazy considering the price for this one and the fact it works perfectly.

This one works with my pool equipment.

Fit exactly. Highly recommend!

I've bought about 10 different o rings for my cartridge filter. I have a hayward c2020 and the o ring is a bit thicker than a lot of one's amazon recommended. This one fit and seems to be holding up so far 2 months in.

Perfect fit, works great