Improved Racing FSM-165 High-Flow 165F Transmission & Differential Fluid Thermostat, 8AN Reduces excessive wear and horsepower losses while improving gas mileage by preventing fluid temperatures from dropping below optimal levels. Maintains a minimum fluid temperature of 167F to (74C) in most conditions Proprietary high flow, low pressure drop design locates the valve assembly completely out of the primary fluid flow Allows a small percentage (less than 10%) of fluid to continually circulate to eliminate air pockets, prevent cold fluid trapped in the cooler from shocking the system, and to allow draining during oil changes Lightweight (12.7 ounces, or 360g, without brackets or fittings), rebuildable, and constructed from 6061-T6 billet aluminum with a black anodized finish. Female -10AN O-ring boss threads. Includes four black anodized aluminum fittings with Viton O-rings for -8AN lines Made in USA. Lifetime manufacturer's warranty