Compression Test Kit Engine Diagnostic Valve N/A Design N/A Tube Material N/A Ring N/A Gasket N/A Features Manual Pressure Release for Maintaining Peak Readings Threaded Adapters for Leak Proof Seals Extended Hoses Adapters for Lawn Mowers Chain Saws and Trimmers Quick Disconnect Coupler for Easy Accessory Changes Displays Analog For Use With Cars Trucks Motorcycles Marine and Small Engines Test Compression 0 to 300 psi