Description
Product Overview
The OmniFilter OK25 Replacement O-Ring Gasket Seals are essential components designed to maintain the integrity of your water filtration system. This kit includes two sets, providing four different sizes to ensure compatibility with various OmniFilter models such as OB1, OB6, WH5, and U25. Manufactured from NSF 61 certified buna-n rubber, these seals are safe for drinking water applications and help prevent leaks that can occur over time. With dimensions of 5.51 x 3.58 x 0.47 inches and a weight of 1.13 ounces, these O-rings are compact yet durable, making them easy to store and install. The product has been available since October 12, 2015, and is backed by positive customer reviews, reflecting its reliability and performance in real-world use.

Usage
These replacement O-ring gasket seals are ideal for homeowners and professionals who use OmniFilter water filtration systems in residential or light commercial settings. They are particularly useful during routine maintenance, such as when replacing water filters every third cycle, to address or prevent leaks in the filter housing. Common environments include kitchens, under-sink installations, and whole-house filtration systems where clean, safe drinking water is a priority. The seals fit seamlessly into OB1, OB6, WH5, and U25 housings, accommodating different revisions within these models to ensure a proper seal and uninterrupted water flow.
Why Choose Us
Captain O-Ring LLC stands out by offering high-quality, USA-assembled O-rings that meet rigorous standards for safety and durability. Our products are molded from NSF 61 certified buna-n rubber, ensuring they do not contaminate drinking water and comply with health regulations. We provide a warranty on all our seals, giving you peace of mind and confidence in your purchase. Unlike generic alternatives, our O-rings are specifically designed for OmniFilter systems, reducing the risk of incompatibility and enhancing longevity. This focus on precision and customer satisfaction has earned us a strong reputation, as seen in our high best-seller rankings and positive reviews.
Key Features
- Includes two sets with four different O-ring sizes for broad compatibility with OmniFilter OB1, OB6, WH5, and U25 models.
- Made from NSF 61 certified buna-n rubber to ensure safe, clean drinking water without contaminants.
- Helps prevent and fix leaks in water filter housings when replaced every third filter change.
- Proudly assembled in the USA with a warranty from Captain O-Ring LLC for reliable performance.
- Compact and lightweight design for easy storage and quick installation during maintenance routines.
FAQ
What OmniFilter models are compatible with these O-rings?
The OK25 kit is compatible with OmniFilter OB1, OB6, WH5, and U25 water filter housings, covering various revisions within these models to ensure a proper fit.
How often should I replace the O-ring in my water filter?
It is recommended to replace the O-ring every third filter change to maintain an effective seal and prevent potential leaks in the filter housing.
Are these O-rings safe for drinking water applications?
Yes, they are molded from NSF 61 certified buna-n rubber, which is specifically approved for use in drinking water systems to ensure safety and cleanliness.
Where are these O-rings manufactured?
These O-rings are manufactured and warrantied by Captain O-Ring LLC and are proudly assembled in the USA, supporting quality and local production.
What sizes are included in the OK25 kit?
The kit contains four different O-ring sizes, with two of each size, providing versatility to fit various OmniFilter housing revisions and ensure leak-free operation.





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