Abstract: A lockout device for a component extending from a component supporting structure includes a base member and a shell member. The base member defines an aperture sized to receive the component therethrough, and includes an outer flange portion that extends from the base member. The shell member includes first and second body members configured to be secured together with the base member in a first condition to block access to the component, and movable to a second condition to allow access to the component. At least one of the first and second body members includes an interlock portion received in an outer peripheral recess defined between the flange portion and a surface of one of the base member and the component supporting structure. The first and second members define a clasp portion configured to receive a locking component to secure the first and second body members in the first condition.