273 Viton O-Ring 75A Durometer 9-3/4in ID 10in OD Pack of 5 - Chemical

In this review the focus is on a practical replacement O-ring for workshop and field sealing tasks: the 273 Viton O-ring, sold in a pack of five. The bottom line is simple - this is for technicians and owners who need a durable, chemical- and heat-resistant round seal that holds up in fuel, hydraulic and high-temperature applications. The reviewer found the material choice and durometer make it a reliable fit-replacement for cylindrical overlaps where leak resistance and durability matter most.

Key Features

• Material: Viton fluorocarbon elastomer provides broad chemical resistance for use with fuels, aromatic and aliphatic hydrocarbons and many solvents.
• Temperature range: Rated from -15 degrees F to 400 degrees F, the O-ring works in both low-temperature storage and high-heat service without rapid degradation.
• Durometer: 75A hardness balances flexibility and resistance to penetration, so the ring compresses to seal while resisting extrusion and wear.
• Cross-section: Round profile is designed to seal between overlapping cylindrical surfaces and maintain contact under pressure.
• Standards: Manufactured to AS568A sizing, so it is interchangeable with common industry O-ring sizes for quick replacement.
• Pack quantity: Supplied as a pack of five, offering spare parts for multiple repairs or routine maintenance.

Who It's For

This O-ring is aimed at maintenance technicians, small engine owners, and workshop professionals who replace seals in fuel bottles, hydraulic fittings, and equipment that sees elevated temperatures or exposure to oils and fuels. It is especially useful where a known AS568A size is needed for a direct swap.

It is not the best choice for systems exposed to strong alkalis, ammonia gas, glycol-based brake fluids, or super-heated steam, where other elastomers or specialty seals would perform better. Hobbyists with low-exposure, room-temperature sealing needs might prefer a softer, lower-durometer material for easier compression.

Pros & Cons

Pros

• Excellent resistance to fuels and many chemicals, reducing the frequency of replacements in aggressive fluids.
• Wide operating temperature range supports both cold storage and high-heat environments without rapid failure.
• AS568A sizing and consistent round cross-section make installation straightforward for standard cylindrical seals.
• Pack of five offers good value for routine maintenance and spares.

Cons

• Viton is vulnerable to certain chemicals like low molecular organic acids, alkalis and glycol-based brake fluids, so compatibility checks are required for some fluids.
• At 75A durometer this ring is relatively firm, which may make it harder to seal in very low compression or delicate assemblies compared with softer compounds.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner diameter (ID)	9-3/4 in
Outer diameter (OD)	10 in
Cross-section Width	1/8 in
Durometer	75A
Temperature range	-15 degrees F to 400 degrees F

Our Verdict

This 273 Viton O-ring is a solid choice for professionals and DIYers needing a heat- and fuel-resistant seal in a standard AS568A size. It offers durable leak resistance and good value in a five-pack, but buyers should confirm chemical compatibility for alkalis, ammonia or glycol-based fluids before installing.

Frequently Asked Questions

Is this O-ring suitable for fuel applications?
Yes, Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons, making it appropriate for fuel-related seals.

Will it handle high temperatures?
Yes, the specified operating range up to 400 degrees F makes it suitable for high-heat environments within that limit.

Does the size follow standard specifications?
Yes, the ring is made to AS568A sizing, so it is intended to interchange with standard O-ring dimensions.