473 Viton O-Ring 75A Durometer 24 in ID - Heat and Fuel Resistant

In this review the 473 Viton O-ring is recommended for technicians, hobbyists, and equipment maintainers who need a single durable replacement seal that resists heat, fuels, and many chemicals. The bottom line: it is a straightforward, well-made Viton O-ring that performs where chemical compatibility and temperature range matter most. The review reflects hands-on fit and function reports showing reliable leak resistance and durable performance in fuel bottle and barrel seal applications, making it a practical grab-and-go spare part.

Key Features

• Material: Made of Viton fluorocarbon elastomer, it provides superior resistance to fuels, aromatic and aliphatic hydrocarbons, and many industrial chemicals.
• Temperature range: Rated for use between -15 degrees F and 400 degrees F, it maintains sealing integrity across hot engine bays and cold storage conditions.
• Durometer: The 75A hardness balances flexibility and resistance to penetration, helping the ring hold shape under pressure while providing a reliable seal.
• Cross-section: Round profile designed to seal between cylindrical overlapping surfaces, giving dependable contact and leak control in common plumbing and hydraulic joints.
• Standards: Manufactured to AS568A sizing standards, so it is a drop-in match for devices and assemblies specified to that common O-ring range.
• Chemical compatibility: Suitable for non-flammable hydraulic fuels, silicone oils, benzene, propane, and vacuum environments, expanding usable service cases.

Who It's For

This O-ring suits mechanics, maintenance techs, and DIYers who repair fuel bottles, seals on firearms, hydraulic fittings, or any application needing a resilient, fuel-resistant seal. It is especially useful as a replacement for equipment that lists Viton or fluorocarbon elastomers in service specifications.

It is less appropriate for systems exposed to low molecular weight organic acids, ammonia gas, strong alkalis, or glycol-based brake fluids, where alternative elastomers or seal materials should be considered to avoid degradation.

Pros & Cons

Pros

• Good chemical and fuel resistance, making it reliable in contact with common fuels and hydrocarbons.
• Wide usable temperature range lets it function in both heated engine compartments and cold environments.
• Customers report precise fit and strong leak resistance in common replacements, indicating consistent manufacturing quality.
• 75A durometer gives a useful balance of durability and sealability for many cylindrical joints.

Cons

• Viton is vulnerable to ammonia, some amines, alkalis, and glycol-based fluids, so it is not universal for every chemical service.
• Single pack size requires buying multiples for larger maintenance tasks or inventory stocking.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner diameter	24 in
Outer diameter	24-1/2 in
Cross-section width	1/4 in
Durometer	75A
Temperature range	-15 degrees F to 400 degrees F

Our Verdict

The 473 Viton O-ring is a solid, no-frills replacement that delivers reliable sealing where heat and fuel resistance are required. For anyone needing a single, standards-sized Viton seal that fits common fuel bottles and barrel seals, it represents good value and proven durability, though users handling alkalis or glycol-based fluids should choose a different elastomer.

Frequently Asked Questions

Is this O-ring compatible with gasoline and diesel?
Yes, Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons, making it suitable for gasoline and diesel exposure in most service conditions.

Will it work in high temperature engine applications?
Yes, the rated range to 400 degrees F allows use in many high temperature locations, though actual service life depends on operating conditions and mechanical stress.

Does it meet common sizing standards?
Yes, it is made to the AS568A standard sizing so it can be used as a drop-in replacement where that standard is specified.