---
product_id: 176410469
title: "Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings)"
brand: "captain o-ring"
price: "99 zł"
currency: PLN
in_stock: true
reviews_count: 8
category: "Captain O Ring"
url: https://www.desertcart.pl/products/176410469-captain-o-ring-k4-replacement-o-ring-kit-for-omnifilter
store_origin: PL
region: Poland
---

# NSF 61 certified safe for drinking water 8 precision O-rings included Proudly USA assembled Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings)

**Brand:** captain o-ring
**Price:** 99 zł
**Availability:** ✅ In Stock

## Summary

> 💧 Seal the deal with leak-free confidence!

## Quick Answers

- **What is this?** Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings) by captain o-ring
- **How much does it cost?** 99 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/176410469-captain-o-ring-k4-replacement-o-ring-kit-for-omnifilter)

## 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:** Assembled domestically with quality control and backed by Captain O-Ring LLC warranty
- • **Certified Safety:** Made from NSF 61 certified Buna-N rubber ensuring clean, safe drinking water every time
- • **Leak-Proof Confidence:** 2 full sets of 4 different O-ring sizes to perfectly fit your OmniFilter and more
- • **Universal Compatibility:** Works seamlessly with 15+ major water filter models including OmniFilter, Culligan, DuPont, and Falsken
- • **Durability You Can Trust:** Synthetic rubber construction resists wear and tear for long-lasting seal integrity

## Overview

The Captain O-Ring K4 Replacement Kit includes 8 high-quality Buna-N rubber O-rings in 4 sizes, designed to restore and maintain leak-proof seals for a wide range of popular water filtration systems. NSF 61 certified and proudly assembled in the USA, this kit ensures safe, durable, and reliable performance for your home or office water filters.

## Description

Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings): desertcart.com: Tools & Home Improvement

Review: Great kit for water filters. - Used this to replace the O-Ring in an Omnifilter. Worked perfect. No more leaks!
Review: O ring - It was a perfect fit

## Features

- The Replacement OmniFilter K4 O-Ring Kit (also called K4-4PAK, K4-R, K4-04, K4-DC6-S18) contains 4 different o-ring sizes to fix your leaking water system.
- This convenient 2 set package contains 2 of each size, for 8 o-ring gasket seals total.
- Compatible with: OmniFilter CBF1, CBF3 Series A, CBF20, OB3, OB5, OT32 Series A, Omni Super, Omni Deluxe, Omni Regular, OT5, RO2000, ROT2000-TDS, R12, R14, SFM2 Series A, Total 2, Total Plus, UC2, U30, U400, U450, U500, U600, U700; Culligan US-316; DuPont WFDW12009W, WFDW12000, WFDW13000, WFCH1; and Falsken Heater Treater [FAL-OR-KIT / The Heater Treater 10/20 Replacement O-Ring Kit].
- 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 | B08126ZTYT |
| Best Sellers Rank | #150,205 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #57 in Faucet O-Rings |
| Brand | Captain O-Ring |
| Color | Black (Rubber) |
| Date First Available | November 5, 2019 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.44 ounces |
| Manufacturer | Captain O-Ring LLC |
| Material | Synthetic Rubber |
| Number of Pieces | 8 |
| Package Dimensions | 5.43 x 3.78 x 0.43 inches |
| UPC | 604015686640 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Captain O-Ring
- **Color:** Black (Rubber)
- **Manufacturer:** Captain O-Ring LLC
- **Material:** Synthetic Rubber
- **UPC:** 604015686640

## Images

![Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings) - Image 1](https://m.media-amazon.com/images/I/71EubAxbWzL.jpg)
![Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings) - Image 2](https://m.media-amazon.com/images/I/810QeV2nz7L.jpg)
![Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings) - Image 3](https://m.media-amazon.com/images/I/71VFZfUTdNL.jpg)
![Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings) - Image 4](https://m.media-amazon.com/images/I/71QwDmEri6L.jpg)
![Captain O-Ring - K4 Replacement O-Ring Kit for OmniFilter K4, CBF1, CBF3, SFM2, U30, USM2, OT32, RO2000, RO2050, and More (2 Sets, 8 Orings) - Image 5](https://m.media-amazon.com/images/I/81ZaPfQz2VL.jpg)

## Questions & Answers

**Q: will this fit the ot 32 series b housing?**
A: Hello.  Yes, the Omnifilter OT32 uses these K4 o-rings.

**Q: I need a replacement ring for my saluspa miami filter. Where is this product?**
A: Hello.  While this product is manufactured by Captain O-Ring LLC in New Jersey, it is shipped directly from Amazon.  Amazon stores this product at fulfillment centers around the country and ships from the closest fulfillment center to you.  You can see the estimated delivery date near the "add to cart button" to ensure it will arrive in time for your need.

**Q: Will this work with Omnifilter OB1 with the blue o ring?**
A: Hello.  This is not the same as the OK25 o-ring kit that works with the OB1 filter housing.

**Q: Will these fit the omni u500 with the blue gasket ?**
A: Hello.  Yes, this will work with the U500.  This kit includes four different sizes, two of each size.  So two of these o-rings will fit your U500 canister(s).

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great kit for water filters.
*by T***D on May 7, 2025*

Used this to replace the O-Ring in an Omnifilter. Worked perfect. No more leaks!

### ⭐⭐⭐⭐⭐ O ring
*by N***N on September 2, 2025*

It was a perfect fit

### ⭐⭐⭐⭐⭐ Great product!
*by A***R on June 19, 2025*

Good product. Excellent shipper and convenient package. Will use again!

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**Shop now:** [https://www.desertcart.pl/products/176410469-captain-o-ring-k4-replacement-o-ring-kit-for-omnifilter](https://www.desertcart.pl/products/176410469-captain-o-ring-k4-replacement-o-ring-kit-for-omnifilter)

---

*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-03-20*