Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack)

These o-rings fit the Pentair Big Blue filter much better than other brands I have bought. Other brands had a diameter slightly too big for the o-ring channel in the filter sump, making it difficult to seat them in the channel, which required multiple attempts to reattach the sump to the top of the filter to get the assembly leaktight. These o-rings were just right. They seated totally within and against the outside wall of the filter sump o-ring channel, so when the sump was reattached to the top the filter it was leaktight on the first try.

For years I was buying the cheapest rings they were too big causing the grip to be off and impossible to get off when it was time to change the filter. These are thicker and fit perfectly in the housing! You get what you pay for!

Worked fine on my Pentek Big Blue filters. They are a bit thin, but do the job. I had a slight leak (only a drip) on one of the filters after installation, but that stopped after less than 24 hours as the o ring swelled a bit. Just a note that these o rings will swell after use. They will not fit back in the groove because the circumference increases and they will not lay flat in the groove. Always have new o rings on hand when you change your filter or it will be a frustrating experience.

Received the O Rings quickly and they fit my Big Blue filter perfectly. Now I have 2 additional O Rings in case I need them for future filter changes. Thanks for a smooth transaction.

I use these for a Big Blue Water filter and change them every 6 months along with the water sediment filter itself. Easy to install, just follow the instructions. Give these a light coat of food-grade silicon grease (Not Vasiline), hand tighted and then give about 1/8 turn with the filter wrench. No leaks.

No issues.

Worked fine on my Pentair Big Blue filter housing. No leaks Used silicone grease before installing.

O-ring worked really well in my water filter system. Size was exactly like the Pentair ring I removed. Easy to install & sealed well. Price was good. Not much else I can state concerning the ring.

Good fitment. Seems to be good quality rubber. No leaks!

Muy buen producto, hecho con buenos materiales y también buenos terminados

Don’t believe the AI overview or negative comments. These are the real deal. I just tried one of the three o Rings last night and it fits literally perfect. These guys should have made the OEM O rings because my original one was stretched out and this replacement one was perfect. I have the Big Blue Pentek OPAQUE 10 x 4.5 inch system. It sat perfectly in the borders of the cylinder and I was able to secure it with minimal lubricant grease my first attempt refastenig the cynlinder. Could not be happier with these O rings please don’t hesitate it’s totally worth the 15 dollars to not struggle with a heavy filter system.

Excellent fit. Cured water leakage problem.

Finally I can replace my old one and it fits very well.