21pc Radiator Pump Pressure Leak Tester Checker Kit Aluminum Adapters w/Case Aluminum adapters for use with most cars trucks Kit includes hand pump to 35 PSI, 12 Aluminum Radiator Adapters, Thermometer, Form Fitted Case Tester helps detect internal and external leaks. Perfect for head gasket failure detection (which side of block or which cylinder leaks) . Thumb-operated relief valve for quick and easy pressure release and self-locking quick-disconnecting components.