This Caterpillar thermostat & gasket kit 2477133 247-7133 4N-1156 for C-15 C15 3406 is a seal/gasket manufactured by Caterpillar. It seals a joint, shaft, or housing to contain fluid or pressure and keep out dirt and moisture. It is commonly in pumps, cylinders, gearboxes, and other fluid-containing equipment.
