snobli Fuel Tank Gas Cap for Kenworth Trucks — 3.5" ID / 4" OD Aluminum, Non‑Vented with Stainless Chain & Bail

snobli's aluminum fuel cap fits Kenworth fuel tanks with a 3.5-inch inner diameter and 4-inch outer diameter, providing a durable, non-locking closure with stainless chain and bail.

This replacement gas cap is built for heavy-duty trucks that specify ultra low sulfur diesel (ULSD) fuel tank fittings. Made from corrosion-resistant aluminum, it pairs with an 8.0-inch stainless safety chain and a 6.5-inch stainless bail so the cap stays attached while refueling. The cap is non-vented—so it must be installed only on fuel tanks that already have a venting system. Before purchasing, confirm your tank neck dimensions with the photos and measurements provided.

Will this fuel cap fit my Kenworth truck?

Measure the fuel tank neck or your existing cap to be certain. This snobli cap is designed for openings with an inner diameter (ID) of 3.5 inches and an outer diameter (OD) of 4 inches.

• Intended ID: 3.5 inches (approx.)
• Outer diameter: about 4 inches
• Verify by measuring your current cap or neck before ordering

Is this cap vented or locking?

The snobli gas cap is non-locking and non-vented. It provides a solid, threaded closure but relies on the truck's tank venting for pressure equalization.

• Non-locking: quick on/off access during refueling
• Non-vented: must be used only with vented tanks
• Do not install on sealed tanks without a separate vent

What materials and hardware come with the cap?

This cap is machined from aluminum for strength and corrosion resistance and includes stainless-steel attachments to minimize rust in demanding environments. The chain and bail keep the cap tethered to the truck so it won’t be misplaced while fueling.

• Body material: aluminum for durability and light weight
• Chain length: 8.0 inches of stainless steel
• Bail length: 6.5 inches of stainless steel
• Hardware resists corrosion common in road and weather exposure

Can I use this cap with any diesel fuel?

The cap is marked for use with ultra low sulfur diesel (ULSD) tanks and is compatible with typical diesel fueling practices. It does not alter fuel chemistry or filtration; it simply seals the tank opening when in use.

• Marked for ULSD applications
• Not a venting or filtering component
• Suitable for standard diesel tank installations that require a 3.5" ID cap

Who is this for: This snobli fuel cap is aimed at Kenworth owners, fleet maintenance teams, and diesel technicians who need a sturdy, easy-to-install replacement cap that stays attached during refueling. It’s best for trucks with pre-existing tank venting and fuel systems specified for ULSD. If you’re unsure about fit, measure your tank neck or current cap and compare to the listed dimensions before ordering.