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Captain O-Ring’s Replacement 151122 O-Rings are precision-engineered Buna-N seals designed specifically for Pentair Pentek Big Blue water filter housings. This 3-pack offers a perfect OEM size fit (5.5" ID x 5.83" OD x 0.165" thickness), NSF 61 certified materials for safe drinking water, and reliable leakproof performance. Proudly assembled in the USA, these o-rings ensure your filtration system stays secure and efficient with minimal fuss.
| ASIN | B019Y85PR6 |
| ASIN | B0G2SR3JWK |
| Best Sellers Rank | #91,479 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #109 in Faucet O-Rings |
| Brand Name | Captain O-Ring |
| Color | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (3,088) |
| Customer reviews | 4.5 4.5 out of 5 stars (3,088) |
| Date First Available | 18 November 2025 |
| Item Diameter | 5.83 Inches |
| Item Weight | 0.04 Pounds |
| Manufacturer | Captain O-Ring |
| Material Type | Synthetic Rubber |
| Model | 151122x3 |
| Nominal Inside Diameter | 5.5 Inches |
| Nominal Outside Diameter | 5.83 Inches |
| Number of Pieces | 3 |
| Part Number | 151122 |
| Temperature Range | 4E+1 Degrees Fahrenheit |
| UPC | 722589526046 |
| Unit Count | 3 Count |
D**E
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.
E**Z
Muy buen producto, hecho con buenos materiales y también buenos terminados
W**G
Perfect fit even for my old housing, quick delivery.
J**H
Good fitment. Seems to be good quality rubber. No leaks!
J**B
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.
Trustpilot
2 weeks ago
2 weeks ago