can this ring be streching?

Do you mean can it be stretched? Essentially, no. A little bit, but O-rings are not elastic like rubber bands.

Anyone tried these on us water systems magna (grey housing) filters?

It's plumbing. There's no way to know whether a gasket or part will fit without buying it and trying it.

is this the o ring for an Aqua Flow 26258?

The filter housing for this ring is for a 20" Big Blue filter which was installed by Culligan......my guess is the diameter is a standard size for any 20" housing.....but best to confirm with Aqua Flow

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

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

Product ID: 254624639

Details

Brand
Captain O-Ring
Color
black
Item Diameter
5.83 Inches
Material
Buna-N Rubber
Nominal Inside Diameter
5.5 Inches

📏Precision OEM size fit

🛡️Durable Buna-N rubber

🇺🇸Proudly USA assembled

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€ 40.96

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal the deal with precision and peace of mind!

PERFECT OEM FIT - Engineered to match Pentair Pentek Big Blue filters exactly for hassle-free installation.
TRIPLE PACK VALUE - Three premium o-rings included to keep your filtration system running smoothly without interruption.
USA QUALITY ASSURANCE - Assembled in the USA with rigorous quality control for long-lasting performance.
NSF 61 CERTIFIED SAFETY - Made from NSF 61 certified materials for clean, safe drinking water you can trust.
LEAKPROOF SEAL GUARANTEED - Buna-N synthetic rubber ensures a tight, reliable seal preventing costly water damage.

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.

Specifications

ASIN	B019Y85PR6
ASIN	B0G2SR3JWK
Best Sellers Rank	#107,554 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #117 in Faucet O-Rings
Brand Name	Captain O-Ring
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (3,099)
Customer reviews	4.5 4.5 out of 5 stars (3,099)
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

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