413 O-Ring Viton 75A 3in ID 3-1/2in OD 1/4in Width Pack of 5

In this review the 413 O-Ring in Viton with a 75A durometer is evaluated for general sealing and replacement use; it is aimed at technicians, hobbyists, and maintenance staff who need a durable, heat- and fuel-resistant seal. The bottom line: the single biggest reason to buy is chemical and temperature resilience - this O-ring holds up where many general-purpose elastomers fail, making it a reliable replacement for fuel bottle seals, firearm barrel seals, and other cylindrical mating surfaces subject to fuels and high heat.

Key Features

• Material: Viton fluorocarbon elastomer provides superior resistance to fuels, oils, ozone, and weathering compared with many other elastomers.
• Temperature range: Rated from -15 degrees F to 450 degrees F, letting it perform in both cold storage and high-heat operating environments.
• Hardness: A 75A shore durometer balances flexibility and compression set resistance so the ring seals reliably without being too soft.
• Form factor: Round cross-section designed to seal between overlapping cylindrical surfaces for common hydraulic and plumbing fits.
• Standards: Meets Aerospace Standard AS568A sizing, so it fits applications expecting standard 413 dimensions.
• Pack size: Supplied in a pack of five, which is convenient for replacements and small maintenance jobs without buying bulk quantities.

Who It's For

This O-ring is best for maintenance technicians, shooters replacing barrel or suppressor seals, and operators of fuel-handling equipment who need a component that resists fuels, aromatic and aliphatic hydrocarbons, silicone oil, and chlorinated solvents. It is also well suited to applications where heat resistance is required up to roughly 450 degrees F.

Customers who need compatibility with low molecular weight organic acids, ammonia gas, strong alkalis, amines, glycol-based brake fluids, or super-heated steam should look elsewhere or verify chemical compatibility first, because Viton can be vulnerable in those environments.

Pros & Cons

Pros

• Excellent chemical and fuel resistance makes it a reliable choice for fuel bottle and hydraulic sealing replacements.
• Wide usable temperature window allows use in both cold and high-heat situations without rapid degradation.
• Customers report good fit and leak resistance for common replacements like MSA fuel bottles and Remington barrel seals, indicating consistent sizing and quality.
• Pack of five provides immediate spares for routine maintenance and small projects, offering solid value for money.

Cons

• Not compatible with some chemicals such as low molecular organic acids, amines, and glycol-based brake fluids, limiting use in certain specialized systems.

Specifications

Part	413 O-Ring
Material	Viton (fluorocarbon elastomer)
Durometer	75A shore
Inner diameter	3 in
Outer diameter	3-1/2 in
Cross-section width	1/4 in
Temperature range	-15 degrees F to 450 degrees F

Our Verdict

The 413 Viton 75A O-ring is a practical, cost-effective replacement for users who need fuel and heat resistance in a standard-size seal; its sizing consistency and chemical tolerance represent good value for routine maintenance and demanding operating environments. Buy it when you require a durable seal for fuels, aromatic hydrocarbons, or high-temperature applications, but confirm compatibility before using with amines or glycol brake fluids.

Frequently Asked Questions

Is this O-ring compatible with gasoline and diesel?
Yes; Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons, making it suitable for gasoline and diesel exposure.

Will it fit standard 413 grooves?
Yes; the O-ring follows the AS568A 413 sizing standard and is intended to fit common 413 grooves and overlaps.

Can I use it with brake fluid or ammonia?
No; Viton is vulnerable to glycol-based brake fluids and ammonia gas, so avoid those fluids or consult a compatibility chart first.