Fuel petcock for Viper 125-200 cc motorcycles and similar (China, Minsk). The fuel petcock shuts off the flow of gasoline from the tank to the carburetor and lets you set the reserve. Inside there is a strainer filter that traps debris.
Replace it if the petcock leaks, is hard to switch, is clogged or lets gasoline through weakly (the engine starves). The cause of a leak is usually a worn seal or a cracked body.
