SP Tools' Spring Compressor Adapter for 24mm Valve Spring Retainers, No. 91450, was designed to better aide the technician when removing and installing valve springs. Used in conjuction with the Universal OHC Valve Spring Compressor, this two-piece design allows greater access to the valve keepers due to the single arm geometry. The two-piece system allows rotation of the depressing tube to better access the valve keepers.