A selection of valve lockout devices designed specifically to prevent opening or closing of gas cylinder valves. The Gas Cylinder Lockout is designed specifically to prevent access and the opening or closing of gas cylinder valves. The unit encloses the valve head and is locked in place with 2 interlocking plates. Installs in seconds and provides a quick and easy identification of a full cylinder with the security of a padlock to lock the device in place to prevent unauthorised use. Each lockout is supplied with 2 extra labels which can be fixed onto the lockout to depict if the cylinder currently being locked out is full or empty. Interior size of 84mm dia. x 150mm, accepts neck rings up to 34mm dia.