Rheem PROTECH anode rods are an important line of defense in preventing corrosion and leaks in your water heater. These devices work because the metal in the rod is sacrificed so the tank does not corrode. As the anode works, the life of the water heater is increased. The anode should be checked and replaced every couple of years.. Application: Water Heater. Compatible Brand/Model: Select Rheem water heaters. Finish Family: Silver Metallic. Material: Magnesium. Pack Size: 1. Product Weight (lb.): 1.48 lb. Returnable: 90-Day. Product Depth (in.): 44 in. Product Height (in.): 1 in. Product Width (in.): 1 in. Material: Magnesium. Application: Water Heater. Finish Family: Silver Metallic