Aluminum Gas Cap Vent Hose for Honda XR CRF RM KX YZ 50cc 65cc 85cc 125cc 250cc ATV Dirt Pit Bike (Silver) Fits most gas tanks with vent hose It provides a pathway for the air trapped inside your gas tank to release while adding fuel. This process greatly reduces the gas vapors that escape into the air during fueling. The gas vent cap is constructed of durable aluminum and the breather tube is made from sturdy plastic. It protects the gas tank from filling up with dirt, dust and debris. Works great for everyday use or in more extreme motocross environments. It offers premium protection and precise design with a sleek, low profile allowing you to drive protected while unaffected.