This fuel cap is designed for use on select compatible Kenworth trucks, This cap is built and designed in America by the brand Fuel Tank Accessories. We recommend measuring using the photos on the listing to verify sizing. ID of 3.5" and OD of 4". This cap is non locking and for diesel tanks marked ULTRA LOW SULFUR DIESEL and LOW SULFUR DIESEL. This cap is not vented, your fuel tank must be vented. This cap is aluminum and has a 8.0" chain & 6.5" bail.