The Tool Aid Cylinder Leak-Down Test Kit, No. 33500, diagnoses internal engine problems like leaking head gaskets, bad rings, and defective valves. This kit comes with a top dead center whistle that can be connected to the testing hose. Dual 2-1/2" gauges with protective rubber boot read to 100 psi/7 bar. Test hose and gauges come with quick connect fittings for easy setup and use. A 0.04" orifice restriction fitting increases testing accuracy. Includes a 24-1/2" testing hose with 14mm end threads into 10mm, 12mm, and 18mm adapters. Comes packaged in a blow molded case.