Cylinder Leakage Testers; Adapter Leak Tester; OHC; 7.43 in. Long; • Quickly diagnoses failed or leaking valves, pistons, rings, and head gaskets • Large-diameter 3-1/2" gauge face indicates percentage of leakage rather than psi, eliminating the need for math calculations • Includes 4-foot hose with quick-disconnect fitting • Accessory adapter available for 14mm plugs on OHC and HEMI engines