140F Automatic Gas Shutoff (AGS)Automatic gas shutoff switch parts are important safety components mainly used in pool and spa heater electrical systems. When the temperature exceeds the safety limit of 140 degrees Fahrenheit, the AGS LED indicator is illuminated, indicating that replacement is needed.Simple InstallationInstalling the 42002-0025S switch is a simple process, unbolt and remove the heater cover, shut off the pump and all power to the pool heater, disconnect the two wires from the old sensor, unread it, and insert the new switch. Protect your equipment while maintaining a comfortable and controllable water temperature.Multiple Models Compatible2002-0025S Automatic Gas Shutoff Switch (AGS) fits Pentair MasterTemp Pool and Spa Heater Electrical Systems. Also compatible with Pentair STA-Rite Max-E-Therm Pool and Spa Heater Electrical Systems Models SR200, SR333, SR400.High Quality Materials2002-0025S Automatic Gas Shutoff Switch, High Limit Switch is made of high-quality brass, which is corrosion-resistant, not easily damaged, resistant to high temperatures and various outdoor conditions, and can be used for a long time.Repair SymptomsPool Heater Not Running, AGS Error Code, Control Panel Displays HLS.This gas shutoff switch replaces damaged, corroded, rusted or faulty gas shutoff switches. Each switch undergoes rigorous pre-shipment testing, including pressure testing, temperature testing, and air tightness testing.