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General Motors GM-48974-5 EGR Cooler Tester Adapter Set, 5/8" Wheel & Tire Tools>Toe Adjustment Drill America DWCT341B 7/8" HSSGeneral Motors GM 48974 5 EGR Cooler Tester Adapter Set, 5 8" Kent Moore Tool Number: EN 48974 5 GM 48974 5 EGR Cooler Pressure Tester Adapter (4HK1 5 8" hose) is used along with GM 46091 1 Pressure Regulator Assembly to test the EGR cooler for leaks between the coolant side and the exhaust side. The cooling system is drained, and the hoses are removed from the EGR cooler inlet and outlet. The pressure adapter from GM 48974 5 is attached to the EGR