Outfit your semi truck to be Ready for the Road Ahead™ with improved hydraulic flow regulation, with the Campbell 4" Cast Iron Body Butterfly Valve. Thanks to its ability to rotate a circular disc in a pipe, this replacement valve is the ideal solution to permit the flow of gases or fluids. Crafted with an ultra-durable nickel-plated disc to provide long-term reliability. FleetPride is your First Click in Heavy Duty®.