1、Applicable Models: Engine rectifier regulator is fit for 8 to 25 HP engines with 15 Amp alternators. Please confirm whether your model is applicable before buying. 2、OE Number: The part numbers of reference are 4140309,2575503S,4140305,25 403 03,25 403 03S,25 755 03,25 755 03S,41 403 01,41 403 03,41 403 04,41 403 03S /41 403 05,41 403 06,41 403 06S,41 403 08,41 403 08S,41 403 09,41 403 09S,41 403 10,41 403 10S. 3、Protection Function: The rectifier has a battery charging protection function. When the battery power is 100 percent, the rectifier stops charging the battery to prevent the battery from overcharging. 4、Durable Construction: Engines voltage regulator rectifier is made of premium material, which is hardness, excellent heat dissipation, sturdy and durable and has a long service life. 5、Ideal Replacement: Comply with OEM specifications to ensure that the shape and function match the original vehicle, perfect replacement without additional modifications are required.