A push tube adapter for an off-road vehicle which enables the rearward end of a push tube assembly to be mounted on various vehicle mounts. The invention relates to the seeds of lettuce cultivar 40-0401159-B, to the plants of lettuce cultivar 40-0401159-B and to methods for producing a lettuce plant by crossing the cultivar 40-0401159-B with itself or another lettuce cultivar. The light may turn on when the enclosure door is in an open position and the light may turn off when the enclosure door is in a closed position. A duty cycle detector provides a duty cycle detection signal indicative of a duty cycle of the second output signal, and logic controls the first and second tuning circuits based upon the duty cycle detection signal. The surface heater includes: the strip type surface heating element in which a number of strips which are obtained by slitting a metallic thin film are arranged with an interval in parallel with each other and both ends of each adjacent strip are connected with each other; and an insulation layer which is coated on the outer circumference of the strip type surface heating element in a plate form.