Universal Cooling System Tester: Tests radiator caps and cooling systems up to 30 psi, identifying leaks and assessing system integrity. Wide Compatibility: Fits a broad range of standard radiator caps for popular models including GM, Ford, Mercedes-Benz, Jeep, Toyota, Honda, Mitsubishi, Nissan, and more. Adapter Variety for Precision Testing: Includes specific adapters: No 1: GM 4-cylinder (Buick, Chevrolet, Oldsmobile, Pontiac, Cadillac) No 2: Truck applications No 3: Mercedes-Benz, Ford, Chrysler, GM, Jeep, Peugeot No 4 & No 5: Acura, Dodge, Eagle, Honda, Lexus, Mazda, Toyota, etc. Complete Testing Kit: Features “2,3” and “4,5” cap adapters for accurate pressure cap testing, plus a cooling system pump.