---
product_id: 652450963
title: "Captain O-Ring – Replacement Seal Oring for SunSun HW303A, HW303B Canister Filter (2 Pack)"
brand: "captain o-ring"
price: "¥3850"
currency: JPY
in_stock: true
category: "Captain O Ring"
url: https://www.desertcart.jp/products/652450963-captain-o-ring-replacement-seal-oring-for-sunsun-hw303a-hw303b
store_origin: JP
region: Japan
---

# Captain O-Ring – Replacement Seal Oring for SunSun HW303A, HW303B Canister Filter (2 Pack)

**Brand:** captain o-ring
**Price:** ¥3850
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Captain O-Ring – Replacement Seal Oring for SunSun HW303A, HW303B Canister Filter (2 Pack) by captain o-ring
- **How much does it cost?** ¥3850 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/652450963-captain-o-ring-replacement-seal-oring-for-sunsun-hw303a-hw303b)

## 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

## Description

Fix your leaking canister filter and have a spare on hand to prevent costly leaks with Captain O-Ring’s 2-pack replacement o-rings for SunSun canister filters. This o-ring is compatible with SunSun HW303A (HW-303A, 303A) and HW303B (HW-303B, 303B) aquarium canister filters. Confirm your model matches one of the models above before purchasing to ensure you order the correct size that fits your filter. These o-rings are an exact match in size, tolerance, and material to the ones that came with your canister filter when it was new. Molded from OEM spec synthetic rubber for long lasting performance and durability. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA!

## Features

- Replacement Lid/Cover/Head Seal O-Ring for SunSun HW303A (HW-303A) and HW303B (HW-303B) canister filters.
- Approximate O-Ring Dimensions: 8.70” Inside Diameter (just under 8-3/4”), 9.12” Outside Diameter (about 9-1/8”), 0.215” 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!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CPFVNBJ3 |
| Best Sellers Rank | #95,075 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,420 in Aquarium Filter Accessories |
| Brand | Captain O-Ring |
| Brand Name | Captain O-Ring |
| Color | Black (Rubber) |
| Customer Reviews | 4.4 out of 5 stars 36 Reviews |
| Item Diameter | 8.7 inches |
| Manufacturer | Captain O-Ring LLC |
| Material | Synthetic Rubber |
| Material Type | Synthetic Rubber |
| Model | SS-HW303A-OR-2pk |
| Nominal Inside Diameter | 8.7 inches |
| Nominal Outside Diameter | 9.12 inches |
| Number of Items | 2 |
| Number of Pieces | 2 |
| Part Number | SS-HW303A-OR-2pk |
| Set Name | 2 |
| UPC | 810061941569 |
| Unit Count | 2 Count |

## Images

![Captain O-Ring – Replacement Seal Oring for SunSun HW303A, HW303B Canister Filter (2 Pack) - Image 1](https://m.media-amazon.com/images/I/51n60cQ5RVL.jpg)

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**Shop now:** [https://www.desertcart.jp/products/652450963-captain-o-ring-replacement-seal-oring-for-sunsun-hw303a-hw303b](https://www.desertcart.jp/products/652450963-captain-o-ring-replacement-seal-oring-for-sunsun-hw303a-hw303b)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-16*