Derale 15719 This Billet Style Cast Aluminum Fluid Control Thermostat with 1/2″ NPT ports allows the oil to bypass the cooler until it reaches 180°F at which point the internal thermostatic valve will close and force 100% of the oil through the cooler while maintaining a constant pressure system. This process allows the engine/transmission to achieve the ideal operating temperature quicker before passing the oil through the cooler. The unit can be rotated 180° to change flow direction. Hardware kit with hose barb fittings and hose clamps included.Bypasses cooler until fluid temperature reaches 180°F. Provides quicker warm-up temperatures. Perfect for cold weather climates. Can be rotated 180° to switch flow direction. Flows up to 76 Litres per minute. Rated up to 200 psi. Ultra bright finish. 1/2″ NPT inlet/outlet ports. Kit includes 1/2″ hose barb fittings and hose clamps.