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This is the easy way to find air leaks in charged air cooling systems on class 7 and 8 trucks. Using the quick disconnect air fittings, the OTC-5039 connects right to a 3”, 3-1/2” or 4” cooler hose. The unit has a large 2-1/2”, 0 to 60 psi pressure gauge, regulator and relief valve and (2) safety cables.
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