--- product_id: 23942697 title: "Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack)" brand: "captain o-ring" price: "£15.17" currency: GBP in_stock: true reviews_count: 13 category: "Captain O Ring" url: https://www.desertcart.co.uk/products/23942697-captain-o-ring-replacement-151122-o-rings-compatible-with-pentair store_origin: GB region: United Kingdom --- # Leakproof Seal Guarantee Precision OEM Size Fit Proudly USA Assembled Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) **Brand:** captain o-ring **Price:** £15.17 **Availability:** ✅ In Stock ## Summary > 💧 Seal the deal with confidence — your water filter’s best friend! ## Quick Answers - **What is this?** Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) by captain o-ring - **How much does it cost?** £15.17 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/23942697-captain-o-ring-replacement-151122-o-rings-compatible-with-pentair) ## Best For - captain o-ring enthusiasts ## Why This Product - Trusted captain o-ring brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Perfect OEM Fit:** Engineered to match Pentair Pentek Big Blue filter housings exactly for hassle-free installation. - • **Triple Pack Value:** Three durable Buna-N o-rings in one set to keep your water filtration system leak-free longer. - • **Effortless Leakproof Seal:** Designed to seat perfectly on the first try, eliminating frustrating multiple attempts and leaks. - • **NSF 61 Certified Material:** Made from safe, NSF 61 certified Buna-N rubber ensuring clean, contaminant-free drinking water. - • **Trusted Quality & Durability:** Manufactured and warrantied by Captain O-Ring LLC, assembled in the USA for premium reliability. ## Overview Captain O-Ring’s Replacement 151122 O-Rings (3 Pack) are precision-engineered Buna-N rubber seals compatible with Pentair Pentek Big Blue water filter housings. With exact OEM sizing (5.5" ID x 5.83" OD x 0.165" thickness) and NSF 61 certification, these o-rings ensure a perfect, leakproof fit on the first try. Proudly assembled in the USA, they offer durable, reliable performance to maintain clean, safe drinking water and extend your filter’s lifespan. ## Description Product description Captain O-Ring - Replacement Pentek 151122 Water Filter Housing O-Rings Captain O-Ring's replacement 151122 o-rings are compatible with the following filter housings Aqua-Flo H-PR-10BV-1 APEC HBB-20/HBB-10 series (input sizes: 3/4", 1", 1.5"), HBC-20/HBC-10 series (input sizes: 3/4", 1", 1.5") Ace Hardware 49561 Ametek Kleen-Plus HD-10-R50, BBS American Plumber W10-PR, 152014, W2010-PR, 152015, W15-PR, 152016, W2015-PR, 152017, WWHC, 152022 AO Smith AO-WH-PRL Culligan HD-950, HD-950A; Omnifilter BF7 Pentek/Pentair Big Blue Heavy Duty Series (150469, 150470, 150467, 150468, 158799, 150237, 150238, 150233, 150234, 150239, 150240, 150235, 150236, 150671, 150426, 150383, 150672, 150639), Big Blue with Drain (150689, 150690), PBH Series Bag Filter Housings (150360, 150367, 150338, 150337), #10 and #20 (4.5x10” and 4.5x20”) Big Blue (142928 REV B NV13, 150233, 150234, 150235, 150236, 150237, 150238, 150239, 150240, 150383, 150426, 150467, 150468, 150469, 150470, 150639, 150671, 150672, 150686, 150687, 150688, 150689, 150690, 150691, 158799, BBFS-22, BBFS-222) Captain O-Ring's replacement 151122 o-rings are a direct replacement for the following other brand part numbers Ace Hardware 4001756 American Plumber 152032, W10-OR A.O. Smith AO-WH-LG-OR (also called 1074315) APEC O-RING-HB Ametek Kleen-Plus 151122-03 Culligan OR-100, 151122-27, 01019189 HomeMaster #Oring122 Pentek 151122, BB BUNA-N Looking for a different part number that isn't on this list? Contact Captain O-Ring and we'll be happy to help point you in the direction of the correct o-ring part number for your system. Exact OEM size for a perfect fit in your compatible water filter housing The exact OEM size match allows Captain O-Ring’s 151122 o-rings to drop right into your compatible housing with the perfect fit. They won’t pinch or move during installation and won’t bind up during removal when it comes time for your next filter change. Captain O-Ring’s 151122 o-rings are packed flat in their package, rather than curled up like other brands. This allows the o-ring to easily fit into your housing right out of the package. No more wrestling with the o-ring to keep it flat in your filter housing during install. This replacement Pentek 151122 O-ring is used to seal water filter housings. It has an inside diameter of 5-1/2" and outside diameter of just over 5-3/4 inches and is made of nitrile butadiene rubber (Buna-N) for flexibility and resistance to abrasion and tearing. The o-ring is compatible with Pentair/Pentek Big Blue filter housings and many other brand's housings, which are used in various applications, such as drinking water purification, industrial processes, and more (see housing compatibility and full list of replacement part numbers above). What to expect This item includes three (3) O-Rings in a resealable zip-top poly bag with "Captain O-Ring" branded packaging. Manufactured and warrantied against defect for one year by Captain O-Ring LLC. Frequently Asked Water Filter O-Ring Questions How often do I need to change my filter housing's o-ring? Captain O-Ring's high quality replacement water filter housing o-rings are designed for reliable extended use. Still, it is typically recommended to replace your o-ring on every third filter change to ensure it is in top shape to prevent leaks. Can I use grease or lubricant on these o-rings? Since Captain O-Ring supplies high quality o-rings without surface imperfections or tacky/sticky surface texture, lubrication is typically not needed if the filter housing sealing surfaces are clean and free of debris. Simply wet the o-rings with water before installing. However, if lubrication is preferred, these Buna Nitrile rubber o-rings are compatible with silicone based and petroleum based lubricants, as well as natural lubricants like vegetable oil. What if I don't know what o-ring part number my filter housing needs? Not sure which o-ring part number you need for your filter housing? Use our handy printable water filter housing o-ring size chart. Simply print out the chart and lay your old o-ring on the page to see which o-ring it matches with. You can find the size chart listed as "User Guide [PDF]" under the "Product guides and documents" section or the "downloads" section on this page, depending on your desertcart page layout. What if I need a thicker o-ring for a filter housing that isn't listed as compatible with the 151122 o-ring? If your "Big Blue" filter's o-ring is 5.5" in inside diameter, but thicker than 0.165" (closer to 0.210"), then you most likely need the Culligan OR-250 o-ring (found here: desertcart.com/dp/B074THDBQ2). If you're not certain about the o-ring size, use our printable water filter o-ring size chart to print out and size up your old o-ring to the page to confirm the part number needed (see product photos for details) or feel free to contact Captain O-Ring and we'd be happy to help determine the part number you need! Review: Perfect fit - Perfect fit into my water filter tank. My older ones tended to get distorted if used too many times. That leads to leaks. The price of these is just right to buy a new one for every six month replacement. No leaks the first time I used it., and I did not have to reinstall it. I will be buying these repeatedly. Review: Perfect fit replacement parts - Perfect fit on water filter housing. Best practices are to replace o-ring on filter housing with each filter change. I put a light coat of 100% silicone on the o-ring before putting in housing channel to prevent any binding when tightening. ## Features - Replacement 151122 o-rings compatible with Pentair/Pentek style Big Blue Water Filter Housings (3 Pack) - Includes 3 replacement o-rings (also called seals or gaskets) to repair your leaking water filter housing [OEM UPC: 051678511220 , 885343762095] - 151122 OEM Size o-rings are approximately 5.5" Inside Diameter x 5.83" Outside Diameter x 0.165" Thickness. Please confirm that you need this size o-ring and that your filter housing is listed on the list of compatible housings or that your product manual calls for the 151122 o-ring part number or one of the other part numbers listed below. - Direct Replacement for the following part numbers (see description below for full water filter compatibility list): Ace Hardware 4001756; American Plumber 152032, W10-OR; APEC O-RING-HB; Ametek Kleen-Plus 151122-03; Culligan OR-100, 151122-27, 01019189; HomeMaster #Oring122; Pentek 151122, BB BUNA-N - Molded from NSF 61 certified buna-n rubber for safe and clean drinking water. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B019Y85PR6 | | Best Sellers Rank | #5,247 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Undersink Water Filtration Replacement Parts | | Brand | Captain O-Ring | | Brand Name | Captain O-Ring | | Color | black | | Customer Reviews | 4.5 out of 5 stars 3,160 Reviews | | EU Spare Part Availability Duration | 1 Years | | Item Diameter | 5.83 Inches | | Item Weight | 18.14 g | | Manufacturer | Captain O-Ring LLC | | Material | Buna-N Rubber (NSF61 Certified) | | Material Type | Buna-N Rubber (NSF61 Certified) | | Model | 151122x3 | | Nominal Inside Diameter | 5.5 Inches | | Nominal Outside Diameter | 5.83 Inches | | Number of Pieces | 3 | | Part Number | 151122 | | Set Name | 3 Pack | | Temperature Range | 4E+1 Degrees Fahrenheit | | UPC | 722589526046 | | Unit Count | 3 Count | ## Product Details - **Brand:** Captain O-Ring - **Color:** black - **Item Diameter:** 5.83 Inches - **Material:** Buna-N Rubber (NSF61 Certified) - **Nominal Inside Diameter:** 5.5 Inches ## Images ![Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) - Image 1](https://m.media-amazon.com/images/I/61crbTY-o3L.jpg) ![Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) - Image 2](https://m.media-amazon.com/images/I/71R81PJXyaL.jpg) ![Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) - Image 3](https://m.media-amazon.com/images/I/81NAd6c3y8L.jpg) ![Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) - Image 4](https://m.media-amazon.com/images/I/712FUqHv7zL.jpg) ![Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) - Image 5](https://m.media-amazon.com/images/I/715qz9cT8mL.jpg) ## Available Options This product comes in different **Item Package Quantity** options. ## Questions & Answers **Q: can this ring be streching?** A: Do you mean can it be stretched? Essentially, no. A little bit, but O-rings are not elastic like rubber bands. **Q: Anyone tried these on us water systems magna (grey housing) filters?** A: It's plumbing. There's no way to know whether a gasket or part will fit without buying it and trying it. **Q: is this the o ring for an Aqua Flow 26258?** A: 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 **Q: Will these fit the eco pure epw4 filter** A: i dont believe so ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect fit *by T***L on May 8, 2026* Perfect fit into my water filter tank. My older ones tended to get distorted if used too many times. That leads to leaks. The price of these is just right to buy a new one for every six month replacement. No leaks the first time I used it., and I did not have to reinstall it. I will be buying these repeatedly. ### ⭐⭐⭐⭐⭐ Perfect fit replacement parts *by K***I on April 26, 2026* Perfect fit on water filter housing. Best practices are to replace o-ring on filter housing with each filter change. I put a light coat of 100% silicone on the o-ring before putting in housing channel to prevent any binding when tightening. ### ⭐⭐⭐⭐⭐ good deal *by S***Y on May 13, 2026* good product and timely arrival ## Frequently Bought Together - Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack) - KEZE Waterproof Food Grade Silicone Lubricant Plumbers Grease for Valve Sealant Faucet O Rings 1 oz 1-Pack - Pentair Pentek DGD-5005 Big Blue Water Filter, 10-Inch Whole House Sediment Filter Cartridge Replacement, Dual-Gradient Density Spun Polypropylene, 10" x 4.5", 5 Micron, Pack of 1 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/23942697-captain-o-ring-replacement-151122-o-rings-compatible-with-pentair](https://www.desertcart.co.uk/products/23942697-captain-o-ring-replacement-151122-o-rings-compatible-with-pentair) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-25*