Kat's Heaters Thermostatically Controlled Circulating Tank Heater - 120V - 850 Watts
Code: KH13080
Designed for coolant systems with up to an 18-qt capacity, this external tank heater circulates warm fluid to your engine block, heater core, and radiator in the cold. Allows cab to heat up faster, creates easier start-ups, and prevents frozen hoses.