39010200 Tank Clamp O-Ring Replacement Pool and Spa D. E. Filter, Replacement for Pentair (CCP 520/420/320) Clean & Clear Plus Fiberglass-Reinforced Polypropylene Tank Filters and FNS Plus Filters

Great gasket. Old one was stretched out. This fit perfectly and made tank reassembly a snap.

This o-ring was a perfect fit for a replacement on my pentair DE filter. I added a little o-ring lube and it sealed right up. Quality seems no different than the original. Easy installation and overall good value.

Fit perfectly as advertised.

I bought this to replace the O-Ring on our Pentair pool filter. The old O-Ring had deteriorated in the Arizona sun and I could not seal the filter properly using it. The Pentair replacement O-Ring was $60 so this looked like it was worth at least a try. It arrived and I replaced the old O-Ring when I replaced the filters and used some O-Ring Lubricant that I also bought from Amazon, and the filter top seated properly with no leaks.While I can not (yet) vouch for how long this O-Ring will last it does seem to have done the job, and at a much lower cost than the official Pentair version.

It worked perfectly.

Fit well

Don't waste your time or your money! I bought this to save money but it was just a tiny bit smaller in diameter (the cover slipped on super easily), and maybe a tiny bit larger in circumference (the ring slipped onto the base super easily), and it leaked under pressure. I ended up having to buy one at my local pool store for more money, and it doesn't leak. I waited too long to return this one so I ended up paying 50% more and doing the job twice. Waste of time AND money.

Does a good job, but you need to check on it yearly and make sure you install the product properly