OTC's Charged Air Cooler Tester is the easy way to find air leaks in charged air cooler systems on class 7 and 8 truck engines. Large, easy to read 2-1/2 inch pressure gauge is calibrated 0-60 PSI. Kit includes regulator, relief valve, and two safety cables. Quick disconnect air fittings attach to 3 inch, 3-1/2 inch, or 4 inch cooler hoses. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it's a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians' productivity and shop profits.