The OTR.387" Square Dash Parking Bake Valve Knob is designed to provide a better grip for the driver, ensuring that it will withstand heavy use and last for an extended period of time. The square shape of the knob makes it easy to grip and turn, allowing for quick and easy engagement and disengagement of the parking brake. With its bright yellow color, this knob is sure to stand out and make it easy to find. Make sure your parking brake is always ready to go. FleetPride is your First Click in Heavy Duty®.