---
product_id: 592084472
title: "Replacement Seal Oring for SunSun HW304A, HW304B Canister Filter (2 Pack)"
brand: "captain o-ring"
price: "€ 19.43"
currency: EUR
in_stock: true
url: https://www.desertcart.nl/products/592084472-replacement-seal-oring-for-sunsun-hw304a-hw304b-canister-filter-2
store_origin: NL
region: Netherlands
---

# Precise 9.7" ID fit Durable, leak-proof seal Proudly USA assembled Replacement Seal Oring for SunSun HW304A, HW304B Canister Filter (2 Pack)

**Brand:** captain o-ring
**Price:** € 19.43
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal the deal with confidence—never let a leak slow your flow!

## Quick Answers

- **What is this?** Replacement Seal Oring for SunSun HW304A, HW304B Canister Filter (2 Pack) by captain o-ring
- **How much does it cost?** € 19.43 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/592084472-replacement-seal-oring-for-sunsun-hw304a-hw304b-canister-filter-2)

## 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.
- • **Leak-Free Confidence:** Engineered to create a watertight seal, preventing costly leaks and filter downtime.
- • **Perfect Fit Precision:** Exact 9.7-inch inside diameter ensures seamless compatibility with multiple SunSun canister models.
- • **Double Pack Convenience:** Includes two replacement O-rings so you’re always prepared for maintenance without delay.
- • **Trusted Quality Assurance:** Manufactured and backed by Captain O-Ring LLC with a reliable warranty for peace of mind.

## Overview

The Captain O-Ring Replacement Seal is a precision-engineered, durable gasket designed specifically for SunSun HW304A, HW304B, and other compatible canister filters. Measuring approximately 9.7 inches inside diameter and 0.21 inches thick, this 2-pack ensures a perfect, leak-proof fit. Proudly assembled in the USA and backed by Captain O-Ring LLC’s warranty, it offers reliable performance and peace of mind for your aquarium filtration system.

## Description

Captain O-Ring – Replacement Seal Oring for SunSun HW304A, HW304B Canister Filter (2 Pack)

## Features

- Replacement Lid/Cover/Head Seal O-Ring for SunSun HW304A (HW-304A) and HW304B (HW-304B) canister filters, as well as the full list of compatible filters below.
- Compatible with SunSun (Sun Microsystems) 304A (HW304A), 304B (HW304B), 404A (HW404A), 404B (HW404B), 602 (HW602), 602B (HW602B), 603 (HW603), 603B (HW603B) canister filters.
- Approximate O-Ring Dimensions: 9.70” Inside Diameter (just under 9-3/4”), 10.14” (just over 10-1/8”), 0.21” Thick (between 3/16” and 1/4”).
- Package includes two (2) o-rings (also called gaskets, seal rings, or rubber rings). Replace your old, worn, 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!

## Product Details

- **Material:** Rubber
- **Nominal Inside Diameter:** 9.7 Inches
- **Item Diameter:** 9.7 Inches
- **Brand:** Captain O-Ring
- **Color:** Black (Rubber)

## Images

![Replacement Seal Oring for SunSun HW304A, HW304B Canister Filter (2 Pack) - Image 1](https://m.media-amazon.com/images/I/517fxzoXb4L.jpg)

## Frequently Bought Together

- Captain O-Ring – Replacement Seal Oring for SunSun HW304A, HW304B Canister Filter (2 Pack)
- Marine Color 9w Lamp Bulb, Spare Bulb for Sunsun Hw-303b 304b 404b Jup-01 Filter Cf400, Cf500, G23 2 Pin,
- Replacement Impeller for SUNSUN Aquarium Canister Filter (HW304A/HW304B)

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**Shop now:** [https://www.desertcart.nl/products/592084472-replacement-seal-oring-for-sunsun-hw304a-hw304b-canister-filter-2](https://www.desertcart.nl/products/592084472-replacement-seal-oring-for-sunsun-hw304a-hw304b-canister-filter-2)

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-17*