ROAD SUPERIOR TRUCK PARTS 2 1/4" Aluminum Non-Locking Fuel Cap for Hino Trucks — Viton O-Ring & Stainless Chain

ROAD SUPERIOR TRUCK PARTS 2 1/4" Non-Locking Aluminum Fuel Cap is a die-cast aluminum, female-fitting diesel cap with a Viton O-ring, stainless-steel chain and bail, designed to fit Hino medium-duty and refer trailer fuel tanks.

If you maintain Hino L or XL series box trucks or refrigerated trailers, a durable, correctly sized fuel cap is essential to prevent leaks, contamination and premature wear. This 2 1/4" fuel cap is non-venting, made from sturdy aluminum with stainless hardware and a resilient Viton seal. It fits thermally vented tanks and is specified for diesel service; confirm thread diameter and pitch before purchase to ensure a correct match.

How do I confirm this cap fits my Hino truck?

Measure the outside diameter of your existing cap threads or the fuel filler neck before ordering. This cap requires a 2 1/4" across-threads cap with an approximate filler-neck outside diameter of 2 5/16", and it uses 11.5 TPI NPSH female threads.

• Measure across threads of current cap or filler neck
• Verify 11.5 TPI NPSH female thread pattern
• Designed for thermally vented fuel tanks only

What materials and components are included, and why do they matter?

The cap is crafted from die-cast aluminum for light weight and corrosion resistance, paired with stainless-steel chain and bail to prevent rust. A Viton O-ring and rubber gasket reduce the risk of shrinkage and cracking over time, helping maintain a tight seal under diesel service conditions.

• Die-cast aluminum body for durability and reduced corrosion
• Viton O-ring for chemical and heat resistance
• Stainless-steel chain and bail to resist corrosion and retain the cap
• Includes rubber gasket to prevent fuel seepage

Is this cap suitable for venting or locking applications?

This model is non-venting and non-locking, intended specifically for diesel applications on thermally vented tanks. If your vehicle requires a vented or keyed locking cap, choose a different SKU that lists venting or locking as a feature.

• Non-vented design — not for tanks needing internal venting features
• Not keyed or lockable — suited where quick access is required
• Engineered for diesel use only, not gasoline or other fuels

Which Hino models are compatible with this fuel cap?

This cap is specified for select Hino medium-duty chassis and refrigerated trailer tanks. It fits Hino L Series L6 and L7 and Hino XL Series XL7 and XL8 models when the tank threads and dimensions match the listed measurements.

• Compatible with Hino L Series: L6 and L7 models
• Compatible with Hino XL Series: XL7 and XL8 models
• Ideal for medium-duty box trucks and refer trailer diesel tanks

Who is this for? Fleet managers, maintenance technicians, and owner-operators running Hino L or XL series trucks or refrigerated trailers who need a reliable, corrosion-resistant diesel fuel cap will appreciate this part. It’s geared toward users who can confirm thread size and who want a simple, durable non-locking cap with a long-lasting Viton seal and stainless retention hardware.