This is a reverse pattern full manual valve body with a Pro Tree transbrake. Low/reverse clutch is applied in 1st gear for engine braking in 1st gear and for sprag protection. Solenoid activation is not required for reverse gear for more convenient street use. Uses external solenoid which provides a faster release compared to internal type solenoid set ups as well as easy service. Valve body will fully function as a reverse pattern full manual valve body even if power to solenoid is lost or solenoid is not hooked up. For use with push in style modulators. We also have screw in style available, please call or email for price.