When servicing valve spring seals or the valve springs themselves, the springs need to be compressed safely without damaging them or surrounding components. The Powerbuilt Valve Compressor is a handy tool to easily compress valve springs and locks in place to free up both hands. It compresses the valve springs without taking the cylinder head off or readjusting the tool between springs. The high-strength carbon steel compressor tool has a reversible stud mount that compresses valve springs with both 3/8-inch and 7/8-inch sized rocker studs. A 12-inch handle with a comfortable grip produces enough leverage to compress stiffer high-performance valve springs. The spring compressor meets or exceeds ANSI standards and comes with a lifetime warranty.