The ARMADA 8" chain aluminum non locking diesel fuel cap is engineered to protect diesel fuel from debris, dirt, and contaminants, ensuring that your Volvo or Mack truck's fuel system remains clean and functional. This cap is designed to fit perfectly on Volvo and Mack vehicles, providing a secure closure to prevent leaks or spills. An inch chain keeps the cap securely attached, thereby preventing loss or misplacement. Built to withstand harsh weather conditions, this cap ensures compatibility specifically with diesel fuel, offering dependable performance.