475 Viton O-Ring 75A Durometer 26 in ID - Heat and Chemical Resistant

In this review the 475 Viton O-ring is evaluated as a single-purpose replacement seal ideal for applications that demand chemical and heat resistance. The bottom line: this O-ring is for technicians, shooters, and equipment maintainers who need a durable, precisely sized seal that resists fuels and many solvents; it stands out because it combines Viton fluorocarbon material with a 75A hardness to hold shape under pressure and temperature while preventing leaks. The reviewer found it particularly useful where a reliable, direct-fit replacement is needed and where exposure to fuels or high heat is expected.

Key Features

• Material: Made of Viton fluorocarbon elastomer, it provides superior resistance to fuels, aromatic and aliphatic hydrocarbons, and many solvents for longer service life.
• Temperature range: Rated from -15 degrees F to 400 degrees F, making it suitable for both cold storage and high-heat equipment environments without rapid degradation.
• Durometer: At 75A hardness the O-ring resists penetration and extrusion while still offering enough compressibility to form reliable seals on cylindrical overlaps.
• Cross-section: Round profile ensures consistent sealing between mating cylindrical parts such as bottle necks, barrels, and hydraulic fittings.
• Compatibility: Acceptable for non-flammable hydraulic fuels, silicone oil, trichloroethylene, propane and benzene in many service conditions, which reduces the need for frequent replacements.

Who It's For

This O-ring is best for maintenance technicians, firearms owners replacing barrel seals, and users of fuel-handling equipment who need a precise 26 in ID seal that resists heat and common fuels. It also suits laboratory or industrial gear where vacuum, ozone exposure, or weathering resistance matters.

Those who should look elsewhere include users needing compatibility with glycol-based brake fluids, strong alkalis, ammonia gas, amines, or super-heated steam, since Viton is vulnerable to these agents. Also, do not choose this if a softer or much harder durometer is required for a specific dynamic sealing application.

Pros & Cons

Pros

• Good fit and leak resistance in reported uses such as MSA fuel bottles and Remington barrel seals.
• High heat tolerance up to 400 degrees F preserves integrity in hot environments.
• Durable 75A hardness balances sealing and resistance to penetration for long-term value.
• Works with a wide range of hydrocarbons and solvents common in industrial and field use.

Cons

• Not compatible with glycol-based brake fluids, strong alkalis, amines, or super-heated steam, limiting use in some automotive or chemical systems.
• The specific size is fixed; users needing custom sizes must source a different part.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner diameter	26 in
Outer diameter	26-1/2 in
Width / cross-section	1/4 in
Durometer	75A
Temperature range	-15 degrees F to 400 degrees F

Our Verdict

The 475 Viton O-ring is a solid, purpose-built replacement for anyone who needs a 26 in ID seal that tolerates fuels, heat, and common solvents. It offers clear value through durability and effective leak resistance, making it a practical choice for maintenance and repair tasks where Viton compatibility is required, provided the chemical exposures avoid known Viton vulnerabilities.

Frequently Asked Questions

Is this O-ring suitable for fuel exposure?
Yes. The Viton material is compatible with many fuels, aromatic and aliphatic hydrocarbons, and silicone oils as described, making it suitable for fuel-handling seals.

What temperatures can it handle?
The O-ring is rated from -15 degrees F to 400 degrees F for most sealing applications within that range.

Can it be used with brake fluids or strong alkalis?
No. Viton is vulnerable to glycol-based brake fluids, strong alkalis, amines, and similar chemicals, so avoid those environments.