227 Viton O-Ring 75A, 2-1/8 in ID x 2-3/8 in OD - Durable Seal Pack

In this review the 227 Viton O-ring is evaluated for its suitability as a replacement or maintenance seal in fuel, hydraulic, and heat-exposed applications. The bottom line: this pack of 100 o-rings is aimed at technicians, shop owners, and DIYers who need a reliable, chemically resistant seal in medium-hardness Viton. The single biggest reason to buy is the material and temperature capability - the fluorocarbon elastomer offers strong resistance to many fuels and chemicals and holds up across a wide temperature range, making these o-rings a practical choice for replacements and routine service.

Key Features

• Material: Made of Viton fluorocarbon elastomer, the rings resist many fuels, oils, and aromatic and aliphatic hydrocarbons for longer service life.
• Temperature range: Rated from -15 degrees F to 400 degrees F, they maintain sealing performance from subzero to high-heat environments.
• Durometer: The 75A hardness balances compression set resistance and flexibility to perform as a durable seal in dynamic and static joints.
• Shape and size: Round cross-section with 2-1/8 in ID and 2-3/8 in OD provides a consistent seal between overlapping cylindrical surfaces common in plumbing and fuel fittings.
• Standards: Manufactured to the AS568A sizing standard, simplifying selection when replacing standard o-rings.
• Pack quantity: Supplied in a 100-pack, which reduces downtime and simplifies inventory for recurring maintenance tasks.

Who It's For

The 227 Viton O-ring is best for maintenance professionals, hobbyists working on fuel systems, and industrial technicians who need a chemical- and heat-resistant seal in medium-hardness material. It is especially useful where compatibility with silicone oils, chlorinated solvents, propane, and many aromatic hydrocarbons is required.

Those who need seals for service with low molecular weight organic acids, ammonia gas, strong alkalis, or glycol-based brake fluids should look at alternate elastomers, since Viton is vulnerable to those specific chemistries. Also, for applications requiring extreme softness or very low-temperature flexibility below the rated range, a different compound may be preferable.

Pros & Cons

Pros

• Excellent chemical and heat resistance for many fuels and solvents, supporting reliability in demanding systems.
• 75A durometer offers a useful balance of durability and sealing ability for both static and some dynamic joints.
• Pack of 100 gives good value and reduces the need for frequent reorders for shops and service crews.
• Meets AS568A sizing which simplifies replacement and compatibility with standard fittings.

Cons

• Not compatible with some substances such as ammonia gas, amines, and glycol-based brake fluids, limiting use in certain chemical environments.
• The 75A hardness may be firmer than ideal for precision low-pressure or very sensitive fittings requiring softer seals.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Size	2-1/8 in ID x 2-3/8 in OD
Cross-section	Round
Durometer	75A
Temperature range	-15 degrees F to 400 degrees F
Quantity	Pack of 100

Our Verdict

The 227 Viton O-ring is a practical, cost-effective choice for anyone needing a robust seal that tolerates heat and common fuels. Its 75A hardness and AS568A sizing make it a reliable replacement for many plumbing and fuel applications, and the 100-count pack offers clear value for shops and regular maintenance. Choose a different compound only when your service fluid is one of the known incompatibilities.

Frequently Asked Questions

Are these o-rings compatible with gasoline and diesel?
Yes, Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons listed in the product description.

Will these seals work at high temperatures?
Yes, they are rated to 400 degrees F and hold up in many high-heat sealing applications.

Can I use them with brake fluid?
No, Viton is vulnerable to glycol-based brake fluids, so choose a brake-fluid-compatible elastomer for those systems.