This Moose vent cap is simple device that prevents a vacuum build up in the gas tank. I will never have to worry about the long vent line from the gas cap to under the steering stem being kinked again shutting off the gas flow.
Purchased this (twice - last one got torn from the bike and lost in a harescramble) to replace that eyesore vent hose tucked onto the steering stem. No instructions supplied, so I figured I would just heat the bottom with a lighter and push it onto the gas cap while the heated hose was pliable. Seemed to fit just fine. But, later I did notice a hissing noise when I had stopped on a trail ride - sounded like gasoline fume pressure was escaping through the vent, and some gasoline had seeped from around the base - pushed down on it and it has since seemed to have stopped. Gonna cinch a zip-tie around the base for good measure. Moose needs to supply some intructions for proper insallation. Looks good and tidy, though.