Designed to check the amount of cylinder leakage in a 4-stroke engine     With an air source of 70 to 160 psi. this system will pressurize the cylinder with 60 psi. of air     Gauge will register the total percentage of leakage past the rings, head gasket, intake and exhaust valves     10, 12, & 14mm spark plug thread hoses, regulator and gauge included     Speeds up troubleshooting & helps to isolate bad components     Made with high quality regulator and gauge. These cost more, but you get a better tool     Includes convenient carrying box     Instructions included     Made in the U.S.A.