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The Viessmann Consumable Anode Top Chain is designed to corrode in place of your water heater's lining. It is screwed into the top of your water heater. Anode chains use electrolysis to sacrifice itself to extend the life of your water heater. Anode chains draw all corrosion within your water heater, allowing your tank's lining to remain undamaged. The Consumable Anode Top Chain is designed for use with Viessmann Vitocell 100 CVA-79, CVB-79, CVA-120, and CVB-120 water heaters.