Stant 12270 30 Pound Cooling System And Pressure Cap Tester Allows you to test today's car's higher pressure cooling system Color coded dial makes it easy to accurately test higher pressure caps and systems Features a pressure release bar for releasing pressure build-up before removing the head from the neck Comes in its own plastic case for easy storage and carrying Set includes 1- 12559 spacer to drop in 1" deep filler necks for testing, 1- 12552 cap adaptor to check standard "A" size caps, and a complete easy to use instruction manual