New TU-21 Petrol Engine Cylinder Compression Leak Detector Cylinder Leakdown Compression Tester Petrol Engine Tester Gauge Tool Diagnose engine health with precision using the TU-21 leakdown compression tester—designed to pinpoint internal faults like worn rings, valve leaks, and head gasket failures. ✅ Key Features: Dual-Gauge System – Measures input pressure and leakage percentage for accurate diagnostics Leak Detection Made Easy – Identifies worn piston rings, cracked cylinder walls, and valve issues by comparing cylinder pressure loss Universal Fit – Compatible with most petrol 4-stroke engines using 12mm or 14mm spark plug threads Quick-Connect Couplers – Connects easily to shop air (90–100 PSI) and spark plug ports via threaded hose Durable Build – Carbon steel body with precision gauges and reinforced hoses for long-term use