Plug and Pneumatic Plug Lockout • Universal Lockout Device can be used to lockout electrical plugs and quick-release pneumatic connectors. • Suitable for electrical plugs of various types (max. diameter: 3-1/2″ max. length: 5″) and air hose external connectors. Can lock out plugs, cables or pneumatic external thread fittings through the holes in the side of the lockout. • Made of polystyrene material.