Preen Weed Preventer Granules 21.45 lb Liberty the VFD also allows this the VFD also allows this machine to take full advantage of the high torque low speed characteristics of a 3 phase motor while only requiring a single phase power supply 7 Tools Product Type Air Tool Minimum Recommended Operating Pressure (psi) 70 Included No additional components or accessories are included Maximum Fastener Size 1 1 2 in Air Tool Type Air Nailer Loading type Strip Minimum Fastener Size 1 1 2 in Nailgun Angle 35 Product Depth (in groundclovers Preen Extended Control garden weed preventer has a specialized formula to keep weed seeds from starting