A Fuel Tank Cap is to seal the fuel tank's opening securely. It prevents fuel from spilling out during heavy machinery operations, especially when the heavy machinery is subjected to rough terrain or vibrations. Additionally, the cap prevents dirt, dust, water, and other contaminants from entering the fuel tank, ensuring the fuel remains clean and free from impurities.

Attributes:
• Provides an added level of security, preventing unauthorized access to the fuel tank and fuel theft.
• Allows air to flow in and out of the fuel tank.

Applications:
A Fuel Tank Cap provides a secure and tight seal on the fuel tank's filler neck.