Features: This Item is Brand New! Designed to detect a variety of common engine faults including: Worn piston rings, worn valves, cracks in cylinder walls and blown head gaskets. Available with either single gauge or twin gauge manifold. Gauge(s) show % of cylinder leakage or cylinder leakage and cylinder pressure. Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs. TU-21 Cylinder Leak Detector Tester checks the amount of leakage in an engine cylinder & helps determine the source. Best used when comparing a suspect cylinder to a known good cylinder on same engine. Ideal for testing trucks & late model cars where clearance is minimal. Equipped with 2-1/2" input pressure gauge for proper leakage test setup and accurate results. FEATURES: Pinpoint the source of compression problems by doing cylinder leak-down tests Works with domestic and import engines Input and leakage gauges with rubberized housing Air pressure: 0-7 BAR, 0-100 PSI Brass fittings Measures leak percentage from 0-100% 1/8" NPT manifold ports