Lisle 20300 Vacuum Gauge and Fuel Pump Tester is a professional-grade tool that allows for quick and accurate testing of fuel pumps and vacuum lines. It features an easy-to-read dual scale gauge with a range of 0-30 in. Hg and 0-100 kPa, a pressure relief valve, and a 6 ft. long hose. The tester is designed to quickly diagnose problems with fuel pumps, vacuum lines, and other engine components.