--- 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: "$21.84" currency: USD in_stock: true reviews_count: 9 category: "Captain O Ring" url: https://www.desertcart.us/products/564829753-captain-o-ring-replacement-a20063-a20064-orings-for-fluval-304 store_origin: US region: United States of America --- # Exact fit for Fluval 304-407 series Durable, leak-proof motor head seal Proudly USA assembled & warrantied - 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:** $21.84 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal the deal with Captain O-Ring – because your aquarium deserves the best! ## 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?** $21.84 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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 - • **Made in the USA:** Proudly assembled domestically, supporting local craftsmanship and quality standards. - • **Trusted Quality:** Manufactured and backed by Captain O-Ring LLC with a warranty, guaranteeing reliability and peace of mind. - • **Leak-Proof Assurance:** Robust sealing technology prevents costly water damage and protects your aquatic ecosystem. - • **Dual-Pack Convenience:** Two premium o-rings per pack ensure you’re never caught off guard by leaks—always have a backup ready. - • **Precision Compatibility:** Engineered to flawlessly fit Fluval 304, 305, 306, 307, 404, 405, 406, 407 canister filters for seamless maintenance. ## Overview Captain O-Ring’s A20063/A20064 replacement o-rings provide a perfect, leak-proof seal for Fluval 304-407 canister filter motor heads. Sold in a convenient 2-pack, these durable, USA-assembled seals come warrantied by the manufacturer, ensuring reliable performance and peace of mind for aquarium enthusiasts. ## 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: 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 Review: Fluval o trying package - The O-ring worked however I was confused because not both numbers were on the label ## 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 | | ASIN | B0CJSW1QS1 | | Best Sellers Rank | #29,874 in Pet Supplies ( See Top 100 in Pet Supplies ) #303 in Aquarium Filter Accessories | | Brand Name | Captain O-Ring | | Color | Black | | Customer Reviews | 4.5 4.5 out of 5 stars (146) | | Date First Available | September 1, 2023 | | Date First Available | September 1, 2023 | | Department | Unisex, All Ages | | Department | Unisex, All Ages | | Item Package Dimensions L x W x H | 5 x 5 x 0.87 inches | | Item Weight | 1.13 ounces | | Item model number | A20063 O-Ring | | Item model number | A20063 O-Ring | | Manufacturer | Captain O-Ring LLC | | Manufacturer | Captain O-Ring LLC | | Material | O-Ring | | Package Dimensions | 5 x 5 x 0.87 inches; 1.13 ounces | | Target Audience Keyword | fish | | Warranty Description | Manufactured and warrantied by Captain O-Ring LLC | ## 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 ### ⭐⭐⭐⭐⭐ 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 ### ⭐⭐⭐⭐⭐ Fluval o trying package *by J***N on October 9, 2025* The O-ring worked however I was confused because not both numbers were on the label ### ⭐⭐⭐⭐⭐ Great replacement *by A***O on September 9, 2024* These O-rings are a great fit and replacement part for the Fluval 307 and 407 cannister filters. Whenever I do filter maintenance every 3 months I change out the O-rings. Filter has never leaked or given me issues on fitment. ## 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.us/products/564829753-captain-o-ring-replacement-a20063-a20064-orings-for-fluval-304](https://www.desertcart.us/products/564829753-captain-o-ring-replacement-a20063-a20064-orings-for-fluval-304) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-04-27*