This high-quality Vacuum Fuel Pump is designed to fit 50cc and 125cc Chinese scooters. Located at the base of the fuel tank, this part filters and pulses fuel to the carburetor. Key Facts: Inner Diameter of Nut: 14 mm / 0.55 inches Outer Diameter of Nut: 22 mm / 0.87 inches We offer excellent services, easy returns within 30 days with no hassle, the best prices with discounts for multiple purchases, and secure payment processed by PayPal.