I am using this as a fuel line shut off on a 2002 Yamaha Viper. I placed this inline so that at the end of the year or when hauling the sleds I can shut the gas off. I typically burn all of the gas out of the carbs before I store them for the summer. This has allowed me to do that without have to pull a line. The valve has worked very well!
My vacuum operated fuel petcock sometimes does shut off fully. I installed this small but well built little ball valve just after the petcock. It is easy to reach down and turn on or off without looking. This manual shut-off valve gives me added insurance that the fuel is shutoff when the bike is parked in the garage.