7856 Universal Air Powered Cooling System Pressure Tester Astro Pneumatic DescriptionThe 7856 Universal Air Powered Cooling System Pressure Tester Astro Pneumatic’s pressure regulates shop air to test any cooling system or radiator cap for leaks. Quick connector works on nearly all brands of cooling system testing caps and adapters. The 7856 Universal Air Powered Cooling System Pressure Tester Astro Pneumatic fills even large cooling system almost instantly, and provides constant pressure on leaks to trace their source. Gauge displays the common pressures levels for different cooling systems and regulator will max at 30psi to prevent damage.