IJO1101 Features: * Makes compressing the spring and removing the keepers a simple job * No need to remove the cylinder head * Adjustable cam action * No need to readjust the tool after each spring * Use with putting compressed air into the spark plug hole to hold up valvesValve spring compressor tool for replacing valve stem seals or valve springs quickly and easily. * Valve Spring Compressor Warranty: * Lifetime warranty does not cover abuse