Find the ideal fuel tank cap for your truck with our collection of Western Star 4700 Truck Fuel Tank Caps. From anti-siphon tubes to locking flush cap assemblies, we offer durable and secure options to prevent leaks and tampering. Featuring trusted brands like Leak Defender and CSM, these caps ensure superior sealing and ventilation for heavy-duty trucking. Whether you need a gasket, collar, or complete cap assembly, we have the parts to keep your rig.