OTCs No. 4573 Universal Overhead Valve Spring Compressor is a great option for compressing valve springs - facilitating valve spring removal or valve stem seal replacement on many Cars, Vans, & Light Trucks. Ideal for use on installed cylinder heads, especially in vehicles with tight underhood clearances, but can be used for bench work as well. Spring loaded jaws easily grip and compress valve springs. Legs are designed with a built-in offset to compensate for spring wind - keeping tool vertical and stable during use. Includes two spring adapters. Fits valve spring retainers up to 1-13/16 inch diameter. 1-3/8 to 5-5/8 inch jaw opening. 5-7/8 inch throat clearance. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits.