Taesayl 3.5" Diesel Fuel Cap for International Trucks — Non-Locking 3.5" Die-Cast Aluminum with Gasket & Safety Chain

Taesayl's 3½" non-locking diesel fuel cap for International trucks is an OEM-quality, die-cast aluminum replacement that seals securely to reduce leakage and resist corrosion.

Designed as a direct-fit replacement for part number 3591620C2, this 3.5-inch fuel tank cap pairs a rugged aluminum body with internal rubber sealing components and a safety chain to restore a tight, dependable closure to International truck fuel inlets. It’s built to the look and durability standards of original equipment without the locking or vented features.

Will this cap fit my International truck and replace part 3591620C2?

Yes — the Taesayl cap is manufactured to match the nominal dimensions and fitment of the listed OEM part. It is intended for International truck fuel openings that require a 3½-inch, non-locking, non-vented filler cap.

• Compatible replacement for part number 3591620C2.
• 3.5-inch diameter designed to match original filler openings.
• Non-locking style suitable for trucks that use conventional keyed caps.
• Not vented — verify external tank ventilation or separate vent exists.

How durable is the material and what prevents fuel leaks?

The cap uses die-cast aluminum alloy for strength and corrosion resistance, so it resists cracking and environmental wear better than cheaper plastics. Inside the metal body are rubber sealing elements that compress against the tank neck to form a tight barrier and reduce the risk of diesel seepage.

• Die-cast aluminum construction for long-term durability.
• Internal rubber gasket and seals for leak prevention.
• OEM-level fit minimizes movement and wear at the inlet.
• Corrosion- and oxidation-resistant finish for harsh conditions.

What comes in the package and how easy is installation?

Each package includes the fuel cap with its rubber gasket, a safety chain to retain the cap when open, and a small lock attachment point (note: cap itself is non-locking). Installation is straightforward: remove the old cap, clean the filler neck, position the gasket, and thread the new cap until snug to restore a secure closure.

• Includes cap, rubber seal, safety chain, and lock accessory.
• Simple hand-install: clean opening and tighten until seated.
• No special tools required for standard replacement.
• Remove old cap and inspect tank venting before final fitment.

Are there any operational notes I should know before buying?

This model is non-vented; your diesel tank must already have a venting solution or separate vent cap to allow proper fuel system breathing. Because it does not lock, it’s best for applications where locking caps are not required for security or regulatory reasons.

• Non-vented design — ensure tank ventilation is provided elsewhere.
• Non-locking type — consider a locking alternative if theft prevention is needed.
• Intended as a direct OEM-style replacement; confirm compatibility before purchase.
• Regular inspection of gasket and chain recommended for longevity.

Who is this for: Fleet managers, owner-operators, and maintenance technicians seeking a reliable, OEM-style replacement cap for International trucks will appreciate Taesayl’s 3½" aluminum fuel cap. It’s particularly suited for trucks that require a robust, corrosion-resistant non-locking cap and already have proper tank ventilation. Choose this cap when you need straightforward installation, long service life, and an original-equipment fit without added locking or vent features.