MiniTrencher GeoRipper GRTA-S400 S-Series 16" TA Kit for Stihl® Engine - The GeoRipper® S-Series 16" TA Kit is a bolt-on and bolt-off trenching attachment kit that fits on a Stihl® TS420 or TS500i engine (engine not included). It allows users to convert their power cutter (Stihl® TS420 or TS500i) into a GeoRipper® minitrencher, and back, in minutes. It features a new safety bar and dirt deflection system to keep the soil on the ground and fingers away from moving parts.