The National Marker Company ball valve lockout is designed to prevent unauthorized users or operators from turning on the valve handles at a facility. It is mostly used at industrial facilities, chemical plants and pumping stations to ensure safety. Lockout procedures are important to be carried out at facilities to make sure that no unauthorized personnel activates or operates a hazardous equipment, valve or an energy source by accident or intentionally. Such lockouts are used to eliminate controllers from being tempered with and causing serious hazards. These lockouts have a rugged and hinged design, providing a convenient way to quickly ensure that the valves are protected.