81513059 is a visual indicator with anti-surge protection designed for use with pneumatic control valve systems. It operates at 230 VAC with a frequency of 50-60 Hz and features voltage tolerance of +10% to -6%. The indicator is mounted between the pilot solenoid valve and the body of the module, providing visual status indication for pneumatic systems. This accessory is commonly used in industrial automation applications and is also available in ATEX version for use in potentially explosive atmospheres in accordance with 94/9/EC Directive.