No more having to flip the reverse latch over! Designed for use in conjunction with override brake systems, this solenoid valve prevents the brakes from locking on when reversing the vehicle. Simply plumbed into the master cylinder brake pipe and wired into the tow vehicle reversing lights, this normally open valve closes, preventing any line pressure to the brakes. Easy to install. 12 Volt. 3/16 Sae fif inlet and outlet.