snobli Fuel Tank Cap 2 3/8" for Freightliner M2 — Aluminium Alloy with Rubber Seal

Snobli Fuel Tank Cap 2 3/8" is a non-locking, non-vented replacement gas cap designed to fit Freightliner M2 trucks with a 2 3/8-inch filler neck, offering a durable aluminum alloy build, rubber seal, safety chain, and lifting ring.

If your Freightliner M2 or a similar small-box semi uses a round filler neck with a 2 3/8" inside diameter, this Snobli replacement cap provides a straightforward, rugged option. It’s intended as a direct-fit service part for compatible tanks and is not suitable for rectangular steel tanks that originally used brass caps. The cap’s die-cast aluminum alloy construction resists corrosion and tolerates heat up to about 220°F, while the rubber sealing ring and chain keep the cap secure and leak-resistant during daily operation.

Will this cap fit my Freightliner M2 truck?

This cap fits Freightliner M2 trucks that use a circular fuel filler neck with an inside diameter of 2 3/8". It does not fit Freightliner models that have rectangular steel tanks with original brass caps.

• Designed for 2 3/8" inside diameter filler necks
• Compatible with many M2 small-box and semi configurations
• Not compatible with rectangular steel tanks or brass-original setups
• Measure your filler neck before ordering to confirm fit

How durable is the Snobli fuel cap and what materials are used?

The cap is made from high-quality die-cast aluminum alloy that resists corrosion and sheds heat up to roughly 220°F. A molded rubber sealing ring provides a tight seal, and the included safety chain and lifting ring add practical durability for repeated use.

• Die-cast aluminum alloy body for corrosion resistance
• Rubber sealing ring for leak resistance
• Safety chain prevents loss during refueling
• Lifting ring enables easy removal and handling

Is this cap vented or locking, and how does that affect use?

This Snobli cap is non-locking and non-vented, so it’s a simple screw-on replacement that won’t accept a key and won’t equalize tank pressure through vents. That makes it straightforward for service replacement where venting is handled elsewhere.

• Non-locking: no key required, fast access at the pump
• Non-vented: relies on tank or other system venting
• Ideal for operators who need a basic, secure cap
• Check vehicle venting setup to ensure compatibility

What should I check before buying this gas cap?

Confirm the inside diameter of your vehicle’s filler neck is 2 3/8" and that your truck doesn’t require a brass or rectangular-style cap. Also verify whether a vented or locking cap is needed for your particular fuel system or fleet security rules.

• Measure filler neck inside diameter precisely
• Inspect tank shape—round vs. rectangular steel tanks
• Decide if non-locking/non-vented is acceptable
• Compare to original cap style for best replacement match

Who this is for: Fleet managers, owner-operators, and maintenance technicians looking for a reliable, no-frills replacement fuel cap for Freightliner M2 trucks with a 2 3/8" filler neck will find the Snobli cap suitable. It’s tailored for vehicles that need a robust aluminum cap with a secure rubber seal and safety chain, but it’s not the right choice when a vented or locking cap or a brass-style rectangular tank cap is required.