Engine Cylinder Leak Detector Test KitDescriptions: This is a high quality TU 21 cylinder leak detector, including double gauge system, 2 1 2" input pressure gauge, snap on quick connect male connector, gauge scale 0 100PSI, 12mm, 14mm spark plug adapters, air regulator and carry case. Features: Designed to detect a variety of common engine faults such as worn piston rings, cylinder head cracks, worn valves and blown head gaskets. It checks the amount of leakage in an engine cylinder and