The Gates 34148 Heavy Duty Thermostat keeps you Ready for the Road Ahead™ with an OE-exact design, fitting applications with 3/4” deep filler necks. Gain consistent valve response for smooth performance and accurate engine cooling with the temperature sensitive heat motor of this heavy duty engine coolant thermostat by Gates. Experience accurate opening and closing, regardless of pressure changes, with the quality controlled factory calibration of this heavy duty thermostat. FleetPride is your First Click in Heavy Duty®.