PMD Products Valve Spring Compressor on Engine Cylinder Head Remover Installer OHV OHC Pro Use with the cylinder head still on the engine and in the car, or with the cylinder head removed Tool bolts to the head while the lever pivots from the base to compress the spring The tool slides along the depresser tube (shaft) to easily move to from spring to spring for fast removal Applicable for OHV & OHC gas or diesel engines 2 sizes of Valve stem seal Pullers