Please verify that the part number and pictures match the part you are replacing before ordering.
Models/Applications:
Cummins Engines:4B3.9, 4BT3.9, 4BTA3.9, 6B5.9, 6BT5.9, 6BTA5.9
Replacement Part Number(s): Thermostat:3917324 Thermostat Gasket: 3920336 Thermostat Bushing: 3923331