XtremepowerUS Valve Spring Compressor Keeper Seal on Engine Remove Install Tool Ideal for removing valve springs, spring retainers by compressing the valve spring retainer and exposing the valve keeper, remove keepers, uncompress the tool then remove spring Cam action level design for secure valve spring locking into the tool Allow valve springs and valve stem oil seals to be replaced with the cylinder head. For use on a wide range of OHV, OHC and CHV engines. Features a reversible jaw / adaptor and automatic cam-action locking to a re-determined setting.