Gas Fuel Tank Valve Switch Pump Petcock For GY6 50cc 125cc 150cc ATV Go Kart Scooter Moped Petcock Switch fits for GY6 50cc 150cc Engine. Drive face fan is with 19 teeth 18mm x 14mm Roller Weight: 0.5oz Inner Diameter (drive face): 13.6mm Outer Diameter (drive face): 115mm