So it happens.... sometimes we are a bit to cocky and do something a bit to stupid and now out bike is upside down leaking all the valuable fuel out the top of the vent cap. This is just a good way to save it. Face it we cant comfortably carry enough fuel some days, don't cut your day short because your diggin. Install this with your factory vent hose and shut it off when your upside down. Remember to open it up again after!