Fuel Cap Assy Alum Non-Locking Non-Vented & Chain 4" - 3 1/2" Replacement

* Make sure to measure the diameter of your current fuel cap or fuel tank filler neck before placing an order. This non-locking aluminum diesel fuel cap measures 3 1/2 inches with 5.5 TPI NS threads. It features a Viton O-ring for excellent resistance to shrinkage and cracking, along with a stainless steel retaining chain and shackle for added corrosion protection. Approximate dimensions are 3 7/16" through cap threads and 3 1/2" through filler neck threads. This aluminum fuel cap assembly is designed for diesel trucks, featuring a non-locking and non-vented design for specific tank requirements. It includes a convenient chain to prevent loss and is suitable for use on thermally vented tanks. The cap has a diameter of approximately 3.5 to 4 inches, making it a practical replacement option for various truck models. Its durable construction ensures reliable performance, while the clear "DIESEL ONLY" and "TRUCKS" markings help ensure correct fuel application. This cap provides a secure seal for your fuel tank, offering peace of mind during operation. Fuel cap assembly Constructed from aluminum Non-locking design Non-vented Includes a securing chain Designed for diesel fuel only Intended for use on trucks For use on thermally vented tanks only Approximately 3.5 inches in diameter