Outfit your vehicle with critical replacement parts so you can be Ready for the Road Ahead , with the Williams Controls WM787F Series 4-Way 3-Position Pressure Regulator. Due to its safety lockout that prevents accidental lever movement, this hydraulic control lever is the ideal solution to regulate air flow and system pressure. Crafted with exact OEM specs to be a suitable component for active and idle machinery. FleetPride is your First Click in Heavy Duty .