The Tuthill Transfer 2" Aluminum Steel Vented Tank Cap with Base is the perfect solution for keeping your stored liquids safe and pure. This vented design allows air to flow freely in and out of the tank, preventing pressure buildup and contamination. The silver finish adds a sleek, modern look to any tank, while the 2" NPT base ensures a secure fit. This tank cap is the perfect way to keep your stored liquids safe and pure. FleetPride is your First Click in Heavy Duty®.