Signswise 54 *48 *36 (Mm) Model Water Pump Negative Pressure Pump Carburetor Insulator 26cc Gasoline Engine Rc Boat The pumps can increase the cooling water flow when the boat is stationary or low speed mode product Size :6cm*5cm*3cm, package Size:14.5*9*6 Fit :Zenoah marine engines and clones Self-priming function ensure that it can run automatically without engine power With the failure of the diaphragm weight: 0.15kg