bansdans 4" Locking Diesel Fuel Caps 2-Pack — Aluminum Lever-Style, Pressure-Relief, Keys

This is a 2-piece set of 4-inch lever-style aluminum locking diesel fuel caps by bansdans, made to replace OE part numbers 11-04859-100 / 11-04859-200 and fit many Peterbilt models from the 1970s through 2017.

These caps are a direct-fit replacement designed for heavy-duty Peterbilt fuel tanks. Constructed from aluminum with an integrated pressure-relief valve and a non-vented design, each cap locks with its own key and ships complete with sealing rings, safety chains, and four matching keys. The package aims to simplify installation and improve fuel security for commercial trucks.

Will these fuel caps fit my Peterbilt truck?

They are designed to fit a wide range of Peterbilt tanks that accept 4-inch, non-threaded lever-style caps. Check your tank opening size and compare OEM numbers to be sure of compatibility before purchasing.

• Compatible with many Peterbilt models from 1995–2016 and select earlier/later years
• Replaces OE numbers 11-04859-100, 11-04859-200, 572.1015, and 600212
• Non-threaded, lever-style installation—measure your 4" opening to confirm fit

How does the locking and pressure-release system work?

Each cap uses a lever-style locking mechanism that secures the cap to the tank and includes an internal pressure-relief feature to let built-up pressure escape safely during refueling. The caps are non-vented to prevent unwanted fuel vapors from escaping while still allowing safe opening when necessary.

• Lever lock: quick, tool-free operation for everyday use
• Integrated pressure relief: reduces pressure before opening during refueling
• Non-vented design: minimizes vapor loss and exposure

What comes in the box and how easy is installation?

The set includes two locking caps, four keys (two per cap), rubber sealing rings, and two 13-inch safety chains. Installation is straightforward—seat the rubber gasket, lock the lever in place, and secure the chain; no specialized tools are required.

• Complete kit: two caps, four keys, two chains, and replacement seals
• Tool-free lever closure makes swapping caps quick on the roadside
• Each cap has its own unique key for enhanced security

Are there security or maintenance considerations I should know?

Each cap locks independently and comes with its own keyed pair—keys are not interchangeable between the two caps. Periodic inspection of the rubber seal and ensuring the pressure-relief operates freely will extend service life and maintain a reliable seal.

• Two unique locks: keys do not cross-operate between caps
• Inspect gaskets regularly and replace if hardened or damaged
• Keep the pressure-relief area free of debris for proper operation

Who this is for: truck fleet managers, owner-operators, and maintenance technicians who need a robust, OE-replacement 4" locking diesel fuel cap for Peterbilt rigs. If you want a rugged aluminum cap that restores secure locking function, includes all required hardware, and replaces common OE part numbers, this bansdans 2-pack is built for straightforward installation and everyday heavy-duty use.