Viper ATV / UTV Winch Contactor Solenoid 3500lb-5000lb Winches Fully sealed Silver internals - can not corrode Upgraded housing can withstand high heat Treated with a moisture absorbing chemical, like dielectric grease Works with all brands of winches including VIPER, Warn & Ramsey MX-128 : rated for 12V winches 3,500 lb to 5,000 lb