Apparatus for projecting a slug of liquid through the air. The tube is composed of a solid-state electrolyte layer. When an ammonia adsorption amount in a predetermined part on a downstream side equals or exceeds a predetermined threshold, the control device controls the urea addition valve to stop the urea supply or reduce the amount thereof. The insert comprises a body having a blind passage formed axially in the body, a plurality of nozzles formed therein, and a first plurality of heat exchange elements disposed within the body. The end of the locking pin has a reduced diameter, such that, if a purposeful force is placed upon the strut when in a locked position, the pin can shear, allowing the rod to be retracted within the cylinder and the closure member to be closed without damage. Chemical interactions can be minimized and physical compatibility between the compensating materials and the host LTCC dielectrics can be achieved.