The VAS 522 001 Pressure-Loss Tester is used to verify the seal of individual cylinders of spark-ignition and diesel engines. Compression Tester Kit. • It allows to easily locate the leak causing the pressure loss by simply by listening for the sound of air escaping through the leak (e.g. in the inlet or outlet valves, pistons or piston rings) or by looking for air bubbles appearing in the cooling system's expansion tank.
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