The Astro 7856 Universal air powered cooling system pressure tester is designed to test and locate cooling system leaks, test caps or speed up the coolant draining process by regulating shop air pressure. This unit’s Quick connector works on nearly all brands of cooling system testing caps and adapters. The built-in gauge displays the common pressure levels for different cooling systems for up to 30PSI max. The tool provides Constant pressure on leaks to trace their source and fills even larger cooling systems almost instantly. Warning: This product contains chemicals known to the state of California to cause cancer and birth defects or other reproductive harm.