• This twin unit, PTO driven, mounted scarifier is for use behind the SISIS hydromain Twin 25, compact tractors and trucksters. This versatile machine is ideal for use on fine turf areas such as gold greens, bowling greens, tennis courts, cricket squares etc, but is equally effective on amenity turf. A golf green can be completed in 10 minutes and a cricket square scarified in two directions in under 20 minutes.