376 Viton O-Ring 75A Durometer, 9-3/4 in ID - Pack of 10

In this review the 376 Viton O-ring is judged as a practical seal choice for technicians, hobbyists, and maintenance crews who need heat and chemical resistance in a common size. The bottom line is that this pack of 10 rings delivers dependable sealing performance where compatibility with fuels, oils, and many solvents is required. Reviewers found the rings fit common applications cleanly and hold up under elevated temperatures, making them a sensible replacement part when serviceability and resistance to fuels or aromatic hydrocarbons matter.

Key Features

• Material: Made of Viton fluorocarbon elastomer, the material provides strong resistance to heat, fuels, and many chemicals for longer service life.
• Temperature range: Rated for -15 degrees F to 400 degrees F, it handles high-heat environments such as engine compartments and heated process lines.
• Cross-section: The round profile creates a reliable seal between cylindrical overlapping surfaces, reducing the chance of leaks when installed correctly.
• Durometer: At 75A hardness the rings resist penetration and deformation while remaining flexible enough for common static and low-dynamic sealing uses.
• Standards: Manufactured to meet the AS568A sizing standard so the ID, OD, and cross-section match common replacement needs.

Who It's For

This product is best for industrial maintenance teams, firearms and suppressor owners using compatible sizes, and anyone replacing O-rings on fuel bottles, hydraulic fittings, or equipment exposed to fuels and aromatic or aliphatic hydrocarbons. The pack of 10 gives technicians spare parts on hand for routine service.

Those who need compatibility with alkalis, ammonia gas, or glycol-based brake fluids should look for a different elastomer, since Viton has known vulnerabilities to those specific chemistries. Also, for very low-temperature elasticity below the stated range, a different compound would be preferable.

Pros & Cons

Pros

• Good chemical and fuel resistance for long-term exposure to oils and hydrocarbons.
• Wide usable temperature range that covers many engine and process environments.
• Consistent sizing and compliance with AS568A make replacements simple and reliable.
• Pack of 10 offers value and ready spares for maintenance tasks.

Cons

• Not suitable for exposure to low molecular organic acids, ammonia gas, or glycol-based brake fluids.
• 75A hardness is less ideal for ultra-low temperature flexibility or high-dynamic shaft seals.

Specifications

Our Verdict

The 376 Viton O-ring pack is a strong, practical choice for repairs and replacements where fuel, heat, and many solvents are present. It offers dependable sealing in a common size, good value in a pack of 10, and reliable compatibility for most hydraulic and fuel-related uses, though users should choose a different material for alkali or ammonia exposure.

Frequently Asked Questions

Will these O-rings work with gasoline and diesel?
Yes; Viton is compatible with many fuels and aromatic hydrocarbons, making these suitable for gasoline and diesel applications where size matches.

Are these rings good for high-temperature use?
Yes; they are rated to 400 degrees F and hold up well in elevated temperature service within that range.

Can I use them with brake fluid or ammonia?
No; Viton is vulnerable to glycol-based brake fluids and ammonia, so choose a different elastomer for those fluids.