332 Viton O-Ring 75A Durometer 2-3/8 in ID 2-3/4 in OD (Pack of 100)

In this review the 332 Viton O-ring is examined for tradespeople and hobbyists who need reliable seals for fuel, chemical, or heat-exposed applications; the bottom line is that this pack of 100 provides durable, heat- and chemical-resistant seals at a sensible price for routine maintenance and repair. The reviewer found the O-rings offer consistent dimensions and a firm but flexible 75A durometer, which makes them easy to install in pistons, fuel pumps, and threaded assemblies without deforming under moderate compression.

Key Features

• Material: Made of Viton (fluorocarbon elastomer) for excellent resistance to fuels, oils, and many chemicals, extending seal life in harsh environments.
• Temperature range: Usable from -15 degrees F to 400 degrees F, which covers most engine, plumbing, and industrial applications where heat resistance matters.
• Durometer: The 75A hardness balances flexibility and penetration resistance so the ring seals reliably without extruding under typical service loads.
• Shape and fit: Round cross-section designed to provide a tight seal between cylindrical overlapping surfaces, helping prevent leaks in pumps and threaded fittings.
• Standard sizing: Sized to AS568A standards for interchangeability and predictable fit in common grooves and housings.

Who It's For

This product is a practical choice for mechanics, plumbers, and hobbyists who need a bulk supply of durable O-rings for repairs on fuel systems, suppressors, hydraulic fittings, or outdoor equipment that sees heat and weathering. It suits anyone replacing worn seals in applications compatible with Viton, especially where resistance to aromatic and aliphatic hydrocarbons is required.

Those who should look elsewhere include users needing compatibility with strong alkalis, ammonia, glycol-based brake fluids, or super-heated steam, since Viton is vulnerable to those chemicals. If a softer or much lower temperature rubber is required, select a different compound or durometer.

Pros & Cons

Pros

• Excellent chemical and fuel resistance suitable for many service fluids and aromatic hydrocarbons.
• Wide usable temperature range makes it dependable for heat-exposed applications.
• Pack of 100 gives strong value for routine maintenance and multiple replacements.
• Meets AS568A sizing standards for predictable fit in common assemblies.

Cons

• Not compatible with certain chemicals such as low molecular organic acids, ammonia gas, alkalis, and glycol-based brake fluids.
• 75A hardness may be too firm for some delicate seals that require a much softer material.

Specifications

Our Verdict

The 332 Viton O-ring pack of 100 is a solid, cost-effective choice for anyone needing reliable seals that withstand heat, fuels, and many chemicals. It is particularly good value for routine maintenance on fuel pumps, barrels, and threaded assemblies where AS568A sizing and a 75A durometer are appropriate; avoid it only when your application involves chemicals known to attack Viton or requires a much softer compound.

Frequently Asked Questions

Are these O-rings suitable for fuel applications?
Yes; Viton is compatible with many fuels and aromatic hydrocarbons, making these O-rings suitable for fuel pump and related uses.

Will they fit standard AS568 grooves?
Yes; these rings meet AS568A sizing and are intended for interchangeability with common groove dimensions.

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