395 Viton O-Ring 75A Durometer 26 in ID - High-Temp Seal

In this review the 395 Viton O-ring is evaluated for practical sealing tasks where chemical and heat resistance matter. The bottom line: this single 26 in ID, 3/16 in width O-ring is best for technicians and hobbyists who need a reliable replacement seal that tolerates fuels, oils and high temperatures. Its primary strength is material choice - solid Viton (fluorocarbon elastomer) with a 75A durometer - which delivers durability, leak resistance and broad chemical compatibility for demanding service conditions.

Key Features

• Material: Made of Viton fluorocarbon for strong resistance to fuels, aromatic and aliphatic hydrocarbons and many chemicals, reducing seal degradation in aggressive environments.
• Temperature Range: Rated from -15 degrees F to 400 degrees F, allowing use in both cold storage and high-heat engine or industrial applications without rapid failure.
• Hardness: 75A durometer provides resistance to penetration and extrusion while still forming a reliable seal on cylindrical mating surfaces.
• Shape and Fit: Round cross-section is designed to seal between overlapping cylindrical parts, giving predictable compression and leak resistance when sized correctly.
• Standards: Manufactured to meet Aerospace Standard AS568A sizing, which helps ensure interchangeability with common metric and inch O-ring grooves.
• Chemical Use Cases: Compatible with non-flammable hydraulic fuels, silicone oils and many hydrocarbons, making it suitable for fuel bottle seals and certain firearm and suppressor applications noted by users.

Who It's For

The 395 Viton O-ring is aimed at professionals and experienced DIYers who need a tough replacement seal for fuel handling, hydraulic fittings, and other systems exposed to heat or aggressive hydrocarbons. It is particularly useful where compatibility with aromatic fuels or silicone oils is required and where a 26 in ID, 3/16 in cross-section is the correct size.

Those who should look elsewhere include users needing resistance to strong bases, amines, glycol-based brake fluids, ammonia gas or super-heated steam, since Viton is vulnerable to some of those substances. Also, if a softer sealing material or a different durometer is required for very low-pressure, ultra-soft sealing, consider alternatives.

Pros & Cons

Pros

• High heat and chemical resistance from Viton construction gives long service life under demanding conditions.
• 75A hardness balances durability and sealing ability, with customers reporting good leak resistance in fuel bottle and barrel seal applications.
• Correct sizing and AS568A compatibility make it a straightforward replacement for many standard O-ring grooves.

Cons

• Not compatible with certain low molecular weight organic acids, amines, alkaline solutions or glycol-based brake fluids, which limits use in some automotive or chemical systems.
• Single pack means buyers needing multiple replacements will have to order extra units separately.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner Diameter (ID)	26 in
Outer Diameter (OD)	26-3/8 in
Cross-section Width	3/16 in
Durometer	75A
Temperature Range	-15 degrees F to 400 degrees F

Our Verdict

The 395 Viton O-ring is a solid choice when a chemically tolerant, high-temperature seal is required in a 26 in ID size. It delivers dependable leak resistance and durability for fuel handling, hydraulic and some industrial uses, offering good value for anyone replacing worn seals where Viton compatibility is important.

Frequently Asked Questions

Is this O-ring suitable for fuel applications?
Yes, Viton is compatible with many fuels and aromatic hydrocarbons listed in the product description and customers report reliable performance in fuel bottle seals.

What temperatures can this O-ring handle?
This O-ring works from -15 degrees F up to 400 degrees F, covering most cold storage to high-heat scenarios.

Will it resist brake fluid and strong bases?
No, Viton is vulnerable to glycol-based brake fluids, strong alkalis and some amines, so avoid those fluids for long-term use.