1W4879 Core Aftercooler Fits Caterpillar Models model-ST 121 E (961810009-00) 2PK- New Aftermarket Replacement 23x9

2PK- New Aftermarket Replacement 23x9

Engine Family: Perkins 354 series diesel

500 (S/N <280000 Early Power Booster 4

It is a direct replacement for OEM part number D78397

UTS (Late)

1W4879 Core Aftercooler Fits Caterpillar Models model-ST 121 E (961810009-00) 2PK- New Aftermarket Replacement 23x9One New Aftermarket Replacement Core Aftercooler for Caterpillar (Cat) Construction Equipment and Engines This aftermarket replacement core aftercooler (also known as a charge air cooler or intercooler) cools compressed air from the turbocharger before it enters the engine intake, improving combustion efficiency and overall engine performance. It fits a wide range of Caterpillar (Cat) machines and engines powered by the 3306, 3406, 3406B, and 3406C