15/25/26/40mm Water Jet Thruster Boat Pump Spray with 2 blades/3 blades Propeller Coupling for RC Boat. Water Thruster / Water Pump for RC Boats and Vehicles. Water Thruster Upgrade Parts. 15mm: propeller is 15mm(2 blades), it is suitable for boat length about 30CM - 60CM; mounting hole position 16.5mm, like 380/390/2040/2430/2440/2450 motor.
