Taesayl 3½" Diesel Fuel Cap for International Trucks — 3.5" Non-Locking Non-Vented Die-Cast Aluminum, OEM Fit

If you need a straightforward, heavy-duty fuel filler cap that fits International truck openings, this Taesayl 3½" unit is built to meet that need. Made from corrosion-resistant die-cast aluminum with internal rubber sealing components, it replaces part number 3591620C2 and aims to give reliable performance in road and worksite conditions. The cap is non-locking and non-vented, so it seals the tank opening tightly while requiring separate ventilation in the tank system.

Will this cap fit my International truck?

This fuel cap is manufactured to the same nominal dimensions as the original equipment for many International models and is listed as a replacement for part number 3591620C2. It measures 3½ inches in diameter and is made to OEM-quality tolerances for a snug fit.

• Direct replacement for 3591620C2
• 3½" diameter to match standard International filler openings
• Designed to OEM dimensional standards for easy installation

How does the cap prevent diesel leakage?

Leak prevention relies on the cap's internal rubber gasket and the die-cast aluminum body that resists deformation. When installed and tightened, the rubber seal compresses against the filler neck to block fuel escape; the sturdy metal body keeps the seal aligned and intact under vibration.

• Internal rubber sealing components for a tight contact seal
• Die-cast aluminum alloy resists corrosion and maintains shape
• Durable construction reduces risk of breakage under normal use

Is this a locking or vented fuel cap?

The Taesayl 3½" unit is a nominal non-locking, non-vented cap. It does not include an integrated lock cylinder or a vent passage, so your tank must have its own venting arrangement to avoid vacuum or pressure issues during fueling and operation.

• Non-locking design — cap does not include builtin lock actuator
• Non-vented — tank ventilation must be provided separately
• Package includes gasket and safety chain for secure attachment

What do I get in the box and how easy is installation?

The cap ships with the necessary sealing accessories so you can swap it in quickly after cleaning the filler throat. Remove the old cap, clear debris from the opening, seat the rubber gasket, then tighten the Taesayl cap until the seal compresses evenly.

• Includes one fuel tank filler cap, rubber gasket, and safety chain
• Simple hand-tighten installation — no specialized tools required
• Recommended: clean filler opening before installation to ensure sealing

Who is this product for? Professional drivers, fleet maintainers, and equipment owners who run International trucks and need a robust, OEM-dimension replacement cap will appreciate this Taesayl unit. It's best suited for applications where a non-vented, non-locking cap is required and where corrosion resistance and a dependable rubber seal are priorities. If you require integrated locking or venting, choose a model designed with those features or ensure your tank has appropriate venting provisions before installing this cap.