Designed to check the amount of cylinder leakage in a 4-stroke engines. With an air source of 70 to 160 PSI, this system will pressurize the cylinder with 60 PSI of air. Gauge registers the total percentage of leakage past the rings, head gasket, intake and exhaust valves. System includes 10, 12 & 14mm spark plug adapters, regulator & gauge. This tester will speed up troubleshooting and will help to isolate bad components.