New Universal Valve Spring Compressor Valve spring compressor is a must for four-stroke owners Heavy-duty steel construction complete with a plastic carrying case Comes with 16mm, 19mm, 23mm, 25mm, and 30mm collars that feature large windows for easy access to valve keepers Adjustable design works on a wide variety of machines Your browser does not support JavaScript. To view this page, enable JavaScript if it is disabled or upgrade your browser.