367 Viton O-Ring 75A Durometer 7-1/2 in ID 7-7/8 in OD - Durable Seal

In this review the 367 Viton O-ring is judged as a straightforward, heavyduty replacement O-ring for industrial and field use where resistance to fuels, heat and many chemicals matters most. The bottom line: buy this if you need a reliable, heatresistant round crosssection seal for cylindrical fittings - its Viton composition and 75A hardness deliver dependable leak resistance and dimensional stability across a very wide temperature span. Customers report good fit and durability in fuel bottle and firearm seal applications, making it a practical choice when compatibility with common hydrocarbons is required.

Key Features

• Material: Made from Viton fluorocarbon elastomer to provide high resistance to fuels, aromatic and aliphatic hydrocarbons, and many chemicals used in industrial settings.
• Temperature range: Rated for use from -15 degrees F to 400 degrees F, allowing use in high heat environments and most outdoor conditions without rapid degradation.
• Durometer: The 75A shore hardness gives a balance of elasticity and resistance to penetration, helping maintain a tight seal under pressure.
• Shape and fit: Round crosssection geometry provides a reliable seal between overlapping cylindrical surfaces such as bottles, barrels or fittings.
• Standards: Manufactured to meet the AS568A sizing standard so it matches common Oring grooves and replacement requirements.
• Pack quantity: Sold in a pack of 10 which suits maintenance routines and multiple replacement points without frequent reordering.

Who It's For

This Oring is aimed at technicians, maintenance crews, gunsmiths and anyone who needs a robust replacement seal for fuel systems, hydraulic fittings, bottles, or firearm components that see elevated temperatures or exposure to oils and fuels. The chemical compatibility makes it a good choice in workshops, labs and industrial service kits.

Those who should look elsewhere include users needing compatibility with strong alkalis, ammonia, certain amines or glycolbased brake fluids - the material can be vulnerable to those agents. Also, if extreme low temperature flexibility below -15 degrees F is required, a different elastomer may be a better fit.

Pros & Cons

Pros

• Excellent resistance to heat and common fuels, keeping seals intact in hot operating conditions.
• Consistent fit for standard AS568A grooves, which simplifies replacement tasks.
• Pack of 10 offers good value for routine maintenance and multiple repairs.
• Customers report reliable leak resistance and durability in practical applications.

Cons

• Not suitable for prolonged exposure to low molecular organic acids, ammonia, alkalis or glycolbased brake fluids; chemical limits must be observed.
• The 75A hardness may be firmer than preferred for some lowpressure static sealing situations requiring a softer material.

Specifications

Material	Viton (fluorocarbon elastomer)
Color	Black
Inner Diameter (ID)	7-1/2 in
Outer Diameter (OD)	7-7/8 in
Cross-section / Width	3/16 in
Durometer	75A shore hardness
Temperature Range	-15 degrees F to 400 degrees F

Our Verdict

The 367 Viton O-ring is a practical, costeffective choice for anyone needing a heat and fuelresistant round seal that fits AS568A grooves. It offers solid durability and leak resistance for industrial, hydraulic and firearm replacement uses, provided the service environment avoids chemicals known to attack Viton; for those conditions it represents good value and reliable performance.

Frequently Asked Questions

Is this O-ring compatible with fuel and oils?
Yes, Viton is well suited to many fuels, aromatic and aliphatic hydrocarbons, and silicone oil, making it appropriate for fuel systems and related seals.

What temperatures can this O-ring handle?
The specified service temperature range is -15 degrees F to 400 degrees F, covering most high heat and outdoor applications.

Will it work for my MSA fuel bottle or firearm seal?
Many customers report successful fit and function in MSA fuel bottles and Remington 1100 barrel seals; verify AS568A sizing and groove dimensions for a proper match.