The suction cup adapter is made of rubber, which is not easy to break and wear. The suitable size is convenient for storage and ready to use.Clean all carbon deposits on valves and valve guides, apply a thin layer of engine valve abrasive (not included) around the valve and install the valve in the valve guide, secure the correct size valve suction tool Press down on the valve head and slowly rotate the small abrasive tool with a power drill until you get the right finish.
