119 Viton O-Ring 75A Durometer 15/16in ID 1-1/8in OD Pack of 100

In this review the 119 Viton O-ring is judged on durability, chemical resistance and fit for common seal replacements. It is aimed at mechanics, HVAC and plumbing technicians, firearm and fuel-system hobbyists who need a reliable replacement O-ring that resists heat, fuels and many chemicals. The single biggest reason to buy is its material: molded from Viton fluorocarbon elastomer with a 75A durometer, it holds shape and seal under high temperatures and contact with fuels where ordinary elastomers would swell or fail.

Key Features

• Material: Viton fluorocarbon elastomer delivers superior resistance to fuels and many chemicals compared with standard rubber, helping seals last longer in harsh media.
• Temperature range: Rated from -15 degrees F to 400 degrees F, the O-ring performs across wide thermal swings found in engines or hot hydraulic lines.
• Durometer: The 75A hardness balances elasticity and resistance to penetration, giving a reliable compressive seal without extruding under pressure.
• Shape and size: Round cross-section with a 15/16in inside diameter and 1-1/8in outside diameter provides a precise fit for applications that match AS568A standards.
• Chemical compatibility: Suitable for non-flammable hydraulic fuels, silicone oil, aromatic and aliphatic hydrocarbons, and many chlorinated solvents, reducing the need for multiple material types.
• Quantity: Pack of 100 offers value for repairs and routine maintenance, keeping spares on hand for recurring jobs.

Who It's For

This O-ring is best for technicians, hobbyists and industrial users who repair fuel systems, hydraulic equipment, seals on bottles or gear that encounter fuels, oils or elevated temperatures. It is also a practical choice for anyone replacing common AS568A size rings in firearms or specialty gear where a heat- and fuel-resistant material is needed.

Those who should look elsewhere include users needing compatibility with strong alkalis, amines, low molecular organic acids or glycol-based brake fluids, and anyone requiring steam resistance at high temperatures, as Viton is vulnerable to those media.

Pros & Cons

Pros

• Excellent fuel and heat resistance that preserves sealing performance in demanding environments.
• Consistent sizing to AS568A expectations means many customers report good fit for common replacements.
• Pack of 100 provides strong value for maintenance teams and hobbyists who change seals regularly.
• Firm 75A durometer resists penetration and extrusion while maintaining sealing contact.

Cons

• Not compatible with certain chemicals such as ammonia, some alkalis and glycol-based brake fluids, so chemical compatibility must be checked first.
• Higher hardness may feel stiffer than softer compounds for very low-pressure static seals.

Specifications

Brand	Mr O-Ring
Material	Viton (fluorocarbon elastomer)
Durometer	75A
Inside diameter	15/16in
Outside diameter	1-1/8in
Cross-section	Round
Quantity	Pack of 100

Our Verdict

The 119 Viton O-ring is a dependable, value-packed choice for anyone needing a heat- and fuel-resistant replacement that meets common AS568A sizing expectations. It is especially good for fuel-system and high-temperature applications, offering long service life where standard elastomers would deteriorate.

Frequently Asked Questions

Will these O-rings resist gasoline and diesel?
Yes; Viton is compatible with many fuels including aromatic and aliphatic hydrocarbons and is a good choice for fuel-exposed seals.

Can they be used at very low temperatures?
They are rated down to -15 degrees F, so they work in many cold environments but may stiffen near that lower limit.

Are they suitable for brake fluid or steam service?
No; Viton is vulnerable to glycol-based brake fluids and super-heated steam, so use a different material for those media.