An exhaust valve device includes an exhaust valve formed by a valve body, a valve stem and a valve element, which opens and closes an exhaust passage provided in the valve body, mounted on the valve stem that is inserted into and supported rotatably by the valve body; and an actuator that drives the exhaust valve to open and close. The button is moveable between a first position and at least a second position. Said device preferably consists of a kit which contains a determination means in the form of pairs of primers, for implementing a quantitative PCR technique. The tool eliminates any external calculations or table reference typically necessary when bending conduit to clear an obstacle. Each fastener clip includes a resilient arm having a V-shaped engaging end that is engageable with the engaging hole in a respective one of the engaging tongues.