bansdans 4" Locking Diesel Fuel Cap 2-Pack – Aluminum Lever-Style, Keyed, Pressure-Relief for Peterbilt Trucks

These are two 4-inch lever-style aluminum locking diesel fuel caps designed to replace OE part numbers for compatible Peterbilt trucks, supplied with keys, seals, safety chains, and a pressure-relief design for safer refueling.

If you operate or maintain Peterbilt heavy trucks from model years roughly 1972–2017 and need a reliable replacement fuel cap, this two-pack from bansdans offers a direct-fit, tool-free lever lock in a durable aluminum housing. Each cap is non-vented, includes an integrated pressure relief, and comes with its own key and accessories so you can install both caps immediately. The design aims to reduce spills, discourage tampering, and allow easier opening during refueling by relieving built-up pressure.

Which Peterbilt models will accept this fuel cap?

These caps are made to fit many Peterbilt tanks commonly found across older and newer models. Compatibility covers numerous model numbers from the mid-1990s through the mid-2010s, and the caps replace several OEM part numbers for a worry-free swap.

• Fits Peterbilt models such as 330, 337, 348, 357, 359, 379, 389, 567, 579, 587 and similar series.
• Intended as a replacement for part numbers 11-04859-100, 11-04859-200, 572.1015, and 600212.
• Direct-fit lever-style cap — no threaded components to match original tank fittings listed.
• Check your tank bore measurement (4-inch cap) and OEM part number to confirm exact fit.

How does the lever-style locking mechanism and pressure relief work?

The cap uses a lever lock that secures without tools and an integrated pressure relief that lets trapped vapor escape safely during refueling. Each cap locks independently and opens quickly when the lever is released, reducing the risk of fuel spray or difficult removal from pressure buildup.

• Lever-style lock allows quick, tool-free operation for drivers and technicians.
• Pressure-relief feature reduces force required to open after road or thermal pressurization.
• Non-vented design minimizes vapor loss while maintaining safe refueling access.
• Each cap includes its own keyed lock—keys are unique to each cap for added security.

What comes in the box and how easy is installation?

The package contains a complete replacement kit meant for straightforward swapping of worn or missing caps. All parts needed for installation are included so you can replace both tank caps without extra purchases or specialized tools.

• Two 4-inch aluminum locking caps with lever-style locks.
• Four matching keys (two per cap), two rubber sealing rings, and two 13-inch safety chains.
• Simple drop-in installation — remove the old cap, fit the seal, attach the chain, and lock in place.
• Manufacturer support included with 12-month customer service for troubleshooting.

Will these caps prevent fuel theft and leaks?

The keyed locks act as a deterrent to unauthorized access and the seals reduce the chance of leakage from the filler opening. While no product can guarantee prevention of all tampering, these caps add a practical layer of security and containment compared with non-locking or damaged caps.

• Unique keys per cap increase protection against casual theft or fuel siphoning.
• Rubber gaskets and a metal housing improve sealing to reduce drips and vapor loss.
• Durable aluminum construction resists corrosion in road environments.
• Pressure relief lowers stress on seals during hot-cycle expansion, helping maintain a tight fit.

Who is this for: truck owners, fleet managers, and diesel technicians who need a durable, OEM-replacement locking fuel cap for Peterbilt trucks. This two-pack is ideal for operators replacing worn caps, securing fuel tanks, or updating equipment to match OE part references. Verify model compatibility and tank bore size before ordering to ensure a proper fit.