The Bendix two-way (TW) series valves are manually operated, non-graduating, on-off valves. They are extensively used in air systems to control nonmodulating air controlled devices. They may be lever or button operated, direct or remote control. The Bendix+ TW-1 valve is normally panel mounted and can be provided with a steel, zinc or nylon manually operated lever. Some are equipped with a steel lever with connectors for Bowden cable control.