During maintenance work, certain valves on machinery have to be locked in order to protect employees. This ball valve lockout device is used to block access to levers on standard ball valves. It stands out not only due to its low weight, it convinces mainly by the exact fit around the valve. The four arms of the lockout device make for an optimal reinforcement and easily grip even large levers. Padlocks can be exactly positioned due to the many holes on the device.