The WM522 series joystick is a pressure regulating controller with ¼” tube push-to-connect fittings. The WM522D1 model has an electronic switch in the handle to control an additional function. Part Number: 130386 Manufactured by Williams Controls. FleetPride is your trusted partner for all your heavy-duty truck parts needs. Order from FleetPride today and experience the difference. FleetPride is your First Click in Heavy Duty®.