Cat® Thermostats (temperature regulators) are used to regulate engine operating temperature through controlling the flow of fluids entering the engine and ensure proper engine operation for your rugged work environment. Designed to work in unison with the rest of your Cat® components to ensure maximum potential of your equipment.Application:Cat® Thermostats components can operate in heavy-duty applications such as severe vibration, shock, extreme operating temperature ranges, thermal cycle, thermal shock, humidity, corrosion and excessive dust. Consult your owner's manual or contact your local Cat® Dealer for more information.