229 Viton O-Ring 75A Durometer 2-3/8in ID 2-5/8in OD Pack of 25

In this review the 229 Viton O-ring is evaluated for buyers who need reliable seals in demanding environments; the bottom line is that it delivers consistent chemical and heat resistance where standard nitrile rings fail. The pack of 25 covers repeat maintenance or multiple fittings, and the review finds the 75A durometer strikes a practical balance between durability and compressibility for overlapping cylindrical surfaces. Customers replacing worn fuel bottle seals or barrel gaskets will appreciate the fit, and the wide usable temperature range makes it useful for workshop and field service work.

Key Features

• Material: Made of Viton fluorocarbon elastomer, it provides strong resistance to fuels, aromatic and aliphatic hydrocarbons, and many chemicals.
• Temperature range: Rated from -15 degrees F to 400 degrees F, it works across hot engine components and cold storage without rapid degradation.
• Durometer: The 75A hardness gives good resistance to penetration and extrusion while still compressing to form a reliable seal.
• Cross-section: The round cross-section is sized to seal between overlapping cylindrical surfaces and replace common standard O-rings.
• Quantity: Supplied as a pack of 25, it provides spare parts for multiple service intervals or for stocking in a maintenance kit.
• Standards: Manufactured to match the Aerospace Standard AS568A sizing, easing replacement and compatibility with common fittings.

Who It's For

This Viton O-ring is aimed at technicians, hobbyists, and maintenance staff who need seals that tolerate fuel, solvents, and high temperatures, such as in non-flammable hydraulic systems, fuel bottle applications, or firearm and suppressor sealing where heat and chemical exposure are common. The pack size is convenient for those performing recurring repairs or stocking a parts bin.

Those who need compatibility with strong alkalis, ammonia gas, glycol-based brake fluids, or super-heated steam should look for alternative elastomers, since Viton is vulnerable to those media. If a much softer or much harder material is required for a specific dynamic seal, verify durometer needs before selecting this 75A ring.

Pros & Cons

Pros

• Excellent chemical and fuel resistance for applications exposed to hydrocarbons and many solvents.
• Wide usable temperature range allows use from subfreezing service to high-heat engine areas.
• Pack of 25 offers good value and convenient spare parts supply for maintenance tasks.
• Customers report good fit and leak resistance in practical replacements and specialty uses.

Cons

• Not suitable for exposure to low molecular organic acids, ammonia, alkalis, or glycol-based brake fluids, limiting use in some industrial environments.
• The 75A hardness may be too firm for very low-pressure static seals that require a softer compound for full conformity.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Hardness	75A durometer
Inner diameter (ID)	2-3/8 in
Outer diameter (OD)	2-5/8 in
Cross-section width	1/8 in
Pack quantity	25 rings

Our Verdict

The 229 Viton O-ring is a dependable choice for anyone needing robust, heat- and fuel-resistant seals for static and many dynamic applications; it is good value in a 25-pack and fits common AS568A standard sizes. Buy it if your application involves hydrocarbons, high temperatures, or vacuum environments, but choose a different elastomer if exposure to alkalis, ammonia, or glycol brake fluids is expected.

Frequently Asked Questions

Are these O-rings compatible with gasoline and diesel?
Yes, Viton is compatible with fuels and aromatic and aliphatic hydrocarbons, making these rings suitable for many fuel-related seals.

Will they hold up at high temperature?
Yes, they are usable up to 400 degrees F (205 degrees C), suitable for many engine and high-heat applications.

Do they fit standard AS568A sizes?
Yes, these rings meet the sizing standards defined by AS568A which helps ensure compatibility with common fittings.