The Vermeer D40x55DR S3 Navigator® horizontal directional drill delivers excellent productivity in a broad range of ground conditions, from hard, medium and soft rock to loamy/dirt and clay. This rock drill features dual rod technology that uses an inner rod to provide torque to the drill bit, while the outer rod offers steering capability and rotational torque for reaming. The combination provides powerful downhole cutting action and the flexibility to select the appropriate tooling to best match the ground conditions, which can allow the entire install to be completed with one machine.