RV Anode Rod is a sacrificial rod that extends the life of your water heater tank by absorbing the corrosion causing particles in the water. As a result, the water corrodes the rod rather than your water heater tank. This product is compatible with Atwood-style 10-gallon water heaters. The 5/8" OD magnesium anode rod measures 9-1/2" long and has 1/2" NPT threads. Compatibility: Compatible with Atwood-style 10-gallon water heaters. 11593