Lewmar 140TT 2.2kw Gen. 2 Bow Thruster -12V [590003LEW]140TT 2. 2kw Gen. 2 Bow Thruster 12V Maneuvering around the dock area can be difficult, but Lewmars TT Thrusters make docking simple. The revolutionary design of the TT propeller, the latest in Lewmars long history of custom thruster solutions, achieves a perfectly even thrust in both directions for maximum control and maneuverability. All Lewmar Thrusters have been extensively tested, resulting in a smooth, efficient, and quiet performance that will