Semi Truck Locking Fuel Cap 3.5" Vented – Aluminum w/ 2 Keys (SNV431089)

Name: Semi Truck Locking Fuel Cap 3.5" Vented – Aluminum w/ 2 Keys (SNV431089)
Brand: ROADWEST
Price: 41.79 USD
Availability: InStock

Vehicle Fitment

Kenworth (after 1984) Peterbilt (before 1980) Freightliner (before 1984) Western Star (before 1983)

$41.79 USD

$41.79 USD ~~$43.99 USD~~

QC VERIFIED Built for Truckers. We stock it, inspect it, and verify fitment - so you get the right part first time, for less.

Fully secure checkout
Trusted by thousands
Rated and reviewed

Shop safely

Secure your shopping experience with various safe and trusted payment methods.

Shop safely with us

DESCRIPTION

Up to 5% off

Protect your diesel fuel and reduce losses with the ROADWEST SNV431089 Locking Vented Diesel Fuel Caps. This 2-pack of heavy duty aluminum fuel caps is designed for semi trucks and offers a secure locking design with included keys to help prevent fuel theft and contamination.

Each cap features a 3 1/2" nominal size and 5 1/2 threads per inch, engineered for diesel fuel tank applications only. Compatible with a range of Peterbilt, Kenworth, Freightliner and Western Star models, these caps are a direct replacement for common OE and aftermarket part numbers including 572.1036 and SNV431089.

Built from premium aluminum with a durable rubber seal, the caps help maintain a tight seal on the tank to minimize fuel evaporation, leaks and contamination. Whether you are replacing worn or missing caps or upgrading to locking versions, this set is a practical upgrade for fleet and owner-operator trucks.

Heavy-duty aluminum construction – Made from premium aluminum that is corrosion-resistant, wear-resistant and heat-resistant for long service life in demanding road and weather conditions.
Locking design with keys – Each cap includes a secure locking mechanism and keys to help deter fuel theft and unauthorized access to your diesel tanks.
Vented fuel caps – Vented design helps maintain proper tank pressure during fuel expansion and contraction, supporting stable fuel system performance.
Precise fit dimensions – Designed with 3 1/2" nominal size and 5 1/2 threads per inch, suitable for diesel fuel applications only.
Wide semi-truck compatibility – Compatible with many Kenworth (after 1984), Peterbilt (before 1980), Freightliner (before 1984) and Western Star (before 1983) models that use this style cap.
OE replacement cross references – Replaces common part numbers 572.1036 and SNV431089 for easy identification when ordering.
Improved sealing performance – Integrated rubber seal and sealing ring help reduce leaks and prevent dust, water and debris from entering the fuel tank.

Package Includes:

2 × Locking Vented Diesel Fuel Caps (SNV431089 style)
2 × Keys

Brand	ROADWEST
Product Type	Locking Vented Diesel Fuel Caps (2-Pack)
Material	Aluminum
Exterior Finish	Aluminum
Color / Set	2 × Fuel Caps with Keys
Nominal Size	3 1/2" (Diesel fuel tank applications)
Thread Specification	5 1/2 threads per inch
Design	Locking, vented, with rubber sealing ring
Vehicle Service Type	Semi-truck / heavy duty truck
Compatibility (Typical)	Kenworth (after 1984), Peterbilt (before 1980), Freightliner (before 1984), Western Star (before 1983) diesel fuel tanks*
Replaces Part Numbers	SNV431089, 572.1036
Included Components	2 × Fuel caps, 2 × Keys
Function	Secure and seal diesel fuel tanks, help prevent fuel theft and leaks
Fit Type	Direct replacement (verify dimensions and thread before purchase)

*Always confirm compatibility by checking your original cap size, thread specification and part number before ordering.

Shipping Policy

Most ROADWEST orders are processed from our U.S. warehouses within 1–2 business days (Monday–Friday, excluding major U.S. holidays).

We currently ship within the United States only and do not deliver to P.O. Boxes, APO/FPO/DPO addresses, or international addresses.

Shipping Area: United States only
Process Time: In-stock items are usually processed within 1–2 business days (Mon–Fri, excluding major U.S. holidays)
Delivery Method: Standard ground for most items; LTL freight for oversized or extra-heavy parts
Delivery Time: After shipment, delivery typically takes 3–7 business days, depending on item size, destination, and carrier performance
Returns: Most unused items may be returned within 30 days of delivery, subject to inspection and our return guidelines

For full details, please review our Shipping Policy and Easy Return & Refund Policy before placing your order.

Warranty

ROADWEST stands behind the parts we sell. Unless otherwise stated on the product page, your purchase is covered by a 1-Year Limited Warranty against manufacturing defects under normal use.

What’s covered

Defects in materials or workmanship
Premature failure caused by factory-related issues

What’s not covered

Normal wear and tear, cosmetic aging, corrosion from environment/road salt
Damage from improper installation, incorrect wiring, modifications, misuse, or accidents
Labor costs (installation/removal), downtime, towing, or other indirect costs

How to file a claim

Contact us with:

Order number
Product name / SKU
Clear photos or a short video showing the issue

If approved, ROADWEST will provide an appropriate resolution (replacement parts, replacement unit, or refund/credit).

Please do not send items back without return authorization.

For more details, see our Shipping Policy, Easy Return & Refund Policy, and Warranty pages.