Engine Leak Down Tester 14mm Hose ConnectorQuickly tell from the outside when your engine needs an overhaul! This easy to use tester checks ring seals, valves, even head gaskets. Don't wait too long to rebuild that expensive motor but don't do it too soon either! Allows the ability to achieve consistent power Stretch out the time between costly teardowns Rugged design features rubber bumpers to protect the gauges Exclusive Longacre gauge manifold meters the airflow for precise readings 14 mm