Kit Masters' Spectrum Modular Viscous Fan Clutch System dramatically reduces end user downtime by creating same day access to 99 percent of all viscous fan clutches sold in the last 10 years. By creating several universal viscous drive units (heads), along with interchangeable brackets and adapters, the field of viscous fan drives fhas been reduced to just a few components. This helps get their product immediately, resulting in minimal downtime. Components come backed with a one-year / 100,000 mile warranty.