If you want to replace the valve stem seals or other parts of the valve train without removing the cylinder head, you need exactly this tool! The adapter is installed in the spark plug hole along with the O-ring, and then compressed air is used to apply pressure to the cylinder. This prevents the valves from falling into the combustion chamber, allowing you to replace the stem seals without any problems. Fits many engines with the classic M14x1.25 spark plug thread—not just our old Opels :-)
By the way, this part is the perfect complement to our valve removal tool ewz007 for Opel Cih engines.
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