Patented inflatable bladder attaches to radiator or header tank for system testing. NO system adapters required for cooling system pressure testing. Fits bayonet and threaded filler necks on radiators or header tanks. Universal attachment suits automotive, commercial, heavy duty, marine and motorcycle. Includes radiator cap test adapters for testing 8 different radiator cap types Fluid drain tube allows coolant to be returned to the coolant reservoir or safely collected in a container for recycling. Identifies cooling system pressure leaks. Pressure pump: 0-30 PSI gauge; bladder is cycle tested to over 1500 inflations. Suits neck diameters up to 45mm (threaded or bayonet)