Product details:

Tester allows testing of higher pressure cooling systems and pressure caps up to 30 pounds. The gauge includes new cap testing pressure ranges of 17-19 lbs., 20 lbs., and 28-30 lbs. The larger color coded dial makes it easy to accurately test these higher pressure caps and systems. The head also includes a pressure release bar that, when turned clockwise, releases pressure buildup before removing the head from the neck. Pressure tester comes in a plastic carrying case. Also includes a spacer to drop in 1" deep filler necks for testing, cap adaptor to check standard "A" size caps, and a complete easy to use instruction manual.