A gasket for use in a fuel cell system having at least one externally manifolded fuel cell stack, for sealing the manifold edge and the stack face. Furthermore disclosed are methods that are based thereon for controlling an injection quantity and for controlling a rail pressure, and a corresponding common rail injection system. The digital data signal may be further intentionally pre-distorted in accordance with a pre-distortion pattern which is also shared with only intended receivers. When the piston is activated by head contacting plate, it extends and strikes head just behind andor between the eyes with sufficient force to kill the animal with a shock to the brain, but without affecting the external appearance of the animal or fish.