The TERRA-JACK TJA 125 stays in between an underground piercing tool and a small HDD pit launched machine. The directional rod pusher TERRA-JACK 125 is designed for directional house connections and road crossings in lengths up to 30 m (100 ft). The bore channel can be expanded up to 130 mm (5“). It is like a small HDD pit launched machine but doesn’t require bentonite because it only displaces the ground like a mole. On the other hand it is like an underground piercing tool which you can steer. The ground must be easily displaceable.