1Fitment: Voltage regulator is specially designed, replacement for Kubota Tractor B4200, B5100, B6000, B7100 rs1104 j5000, the reference part number is 66611?55250. 2Waterproof and Shockproof: The rectifier adopts high strength materials, with good waterproof performance, surface mount technology, strong shock resistance and anti interference ability. 3Improve Engine Power: The voltage regulator can provide a stable voltage, directly improve the low speed torsion performance of the vehicle, improve the engine power, increase speed, and climb more effectively. 4Save Fuel Consumption: Rectifier can improve ignition efficiency, make fuel burn more fully, improve fuel efficiency and reduce vehicle fuel consumption. 5Improve Headlight Brightness: This replacement voltage stabilizer can improve light dimness or lack of lights, making the lights brighter than before.