--- product_id: 564829753 title: "Captain O-Ring – Replacement A20063 A20064 Orings for Fluval 304, 305, 306, 307, 404, 405, 406, 407 Canister Filter Motor Head Lid Seal Ring (2 Pack)" brand: "captain o-ring" price: "$32.26" currency: USD in_stock: true reviews_count: 9 category: "Captain O Ring" url: https://www.desertcart.ec/products/564829753-captain-o-ring-replacement-a20063-a20064-orings-for-fluval-304 store_origin: EC region: Ecuador --- # Precision fit for Fluval filters Durable leak-proof rubber seal Proudly USA assembled Captain O-Ring – Replacement A20063 A20064 Orings for Fluval 304, 305, 306, 307, 404, 405, 406, 407 Canister Filter Motor Head Lid Seal Ring (2 Pack) **Brand:** captain o-ring **Price:** $32.26 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal the deal with confidence—never let a leak cramp your aquatic vibe! ## Quick Answers - **What is this?** Captain O-Ring – Replacement A20063 A20064 Orings for Fluval 304, 305, 306, 307, 404, 405, 406, 407 Canister Filter Motor Head Lid Seal Ring (2 Pack) by captain o-ring - **How much does it cost?** $32.26 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/564829753-captain-o-ring-replacement-a20063-a20064-orings-for-fluval-304) ## 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 - • **Trusted Quality:** Manufactured and warrantied by Captain O-Ring LLC, guaranteeing reliability and peace of mind. - • **Easy Installation:** User-friendly design lets you swap seals quickly without special tools or stress. - • **Leak-Proof Assurance:** Engineered rubber seals ensure zero leaks, protecting your aquatic ecosystem and home. - • **Dual-Pack Convenience:** Two premium o-rings included—replace now and keep a backup ready to avoid downtime. - • **Perfect Compatibility:** Seamlessly fits Fluval 304-307 & 404-407 canister filters for hassle-free replacement. ## Overview Captain O-Ring’s A20063/A20064 replacement seals are precision-engineered rubber o-rings compatible with Fluval 304-307 and 404-407 canister filters. Sold in a convenient 2-pack, these USA-assembled seals provide a durable, leak-proof fit to maintain optimal filter performance and protect your aquatic environment. Backed by a warranty from Captain O-Ring LLC, they offer an easy, reliable solution to prevent leaks and keep your aquarium running smoothly. ## Description Replace your old, worn, leaking motor head seal with Captain O-Ring’s replacement A20063/A20064 o-rings. Compatible with Fluval 304, 305, 306, 307, 404, 405, 406, 407 Canister Filters. Pack contains two (2) o-rings. Replace your leaking o-ring and have a spare on hand for the future with this handy 2-pack. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA! Review: Worked perfectly. - Product worked perfectly. Easy to install. No leaks! Review: Exact fit, cant go wrong - Capital rings are great I have a fluvall 407 and a 107 and purchase the o-rings for both The nice thing is is you get two o-rings per package so even in the event that the factory one fails you still have a second backup they fit like a charm just remember to put some o-ring grease that's not petroleum based look for food safe Billy skin actually makes a food safe and food contact o-ring lubricant comes in a tube and pretty well priced these will be my go-to from here on out I've had to change one o-ring on each pump and I still have an extra one left over at their price it's a steal it's definitely worth having o-rings and replacing them every once in awhile than having a flooded house and dead creatures ## Features - O-Ring Part Number: A20063 / A20064 (2 Pack) [also called A-20063 / A-20064] - Compatible with Fluval 304, 305, 306, 307, 404, 405, 406, 407 Canister Filters. - The A20063 o-ring seals the motor head/lid to the filter canister of the models listed above. - Contains two (2) o-rings (also called seals or gaskets). Replace your leaking o-ring and have a spare on hand for the future with this handy 2-pack. - Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CJSW1QS1 | | Best Sellers Rank | #32,131 in Pet Supplies ( See Top 100 in Pet Supplies ) #328 in Aquarium Filter Accessories | | Brand | Captain O-Ring | | Brand Name | Captain O-Ring | | Color | Black | | Customer Reviews | 4.6 out of 5 stars 174 Reviews | | Manufacturer | Captain O-Ring LLC | | Material | Rubber | | Material Type | Rubber | | Model | A20063 O-Ring | | Number of Items | 2 | | Number of Pieces | 2 | | Part Number | A20063 | | UPC | 810061941422 | | Unit Count | 2 Count | ## Product Details - **Brand:** Captain O-Ring - **Color:** Black - **Manufacturer:** Captain O-Ring LLC - **Material:** Rubber - **UPC:** 810061941422 ## Images ![Captain O-Ring – Replacement A20063 A20064 Orings for Fluval 304, 305, 306, 307, 404, 405, 406, 407 Canister Filter Motor Head Lid Seal Ring (2 Pack) - Image 1](https://m.media-amazon.com/images/I/516kyacp9YL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worked perfectly. *by R***B on May 8, 2026* Product worked perfectly. Easy to install. No leaks! ### ⭐⭐⭐⭐⭐ Exact fit, cant go wrong *by U***0 on March 4, 2026* Capital rings are great I have a fluvall 407 and a 107 and purchase the o-rings for both The nice thing is is you get two o-rings per package so even in the event that the factory one fails you still have a second backup they fit like a charm just remember to put some o-ring grease that's not petroleum based look for food safe Billy skin actually makes a food safe and food contact o-ring lubricant comes in a tube and pretty well priced these will be my go-to from here on out I've had to change one o-ring on each pump and I still have an extra one left over at their price it's a steal it's definitely worth having o-rings and replacing them every once in awhile than having a flooded house and dead creatures ### ⭐⭐⭐⭐⭐ No more leaking! *by C***. on June 22, 2026* I used some dielectric food safe grease to lube up the O-ring and installed it on my Fluval filter, no more leaks! Its been working for the past 8 months so I'd say its a durable and quality product. ## Frequently Bought Together - Captain O-Ring – Replacement A20063 A20064 Orings for Fluval 304, 305, 306, 307, 404, 405, 406, 407 Canister Filter Motor Head Lid Seal Ring (2 Pack) - Fluval A20061 X06 AquaStop Valve - Fluval Ribbed Hosing for 306/307 - 406/407 9.8Ft A20015 --- ## 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.ec/products/564829753-captain-o-ring-replacement-a20063-a20064-orings-for-fluval-304](https://www.desertcart.ec/products/564829753-captain-o-ring-replacement-a20063-a20064-orings-for-fluval-304) --- *Product available on Desertcart Ecuador* *Store origin: EC* *Last updated: 2026-08-30*