The Suburban Aluminum Anode Rod is designed for use in Suburban Water Heaters. The exclusive Suburban Anode Rod is specifically designed to combat harsh water conditions by yielding to the corrosive action caused by heating water. Make sure to replace your anode annually.• Check your anode rod every time you drain your Suburban water heater.• Anode rod absorbs the corrosive action caused by hot water and prolongs the life of your water heater tank.• Unscrew the anode rod to drain the tank. If the rod is mostly eaten away, replace it with a new one.• Always keep a spare in your RV. Prolongs the life of your water heater tank Check your anode rod every time you drain your Suburban water heater Always keep a spare in your RV | Keller Marine & Rv Suburban 233516 Aluminum Anode Rod for Water Heaters