Usage Tips: Made of magnesium material. Our magnesium rod absorbs oxidizing substances and contaminants in the water through electrolysis, helping to prevent rust in metal water tanks and ensuring prolonged use of your RV water heater. These magnesium anode rods attract corrosive elements, protecting your water heater tank from corrosion and extending its lifespan. Extends the life of a water heater by attracting harmful elements in the water. If the anode rod is depleted or fully corroded, the water heater may begin to rust, crack, fail, and leak. These magnesium anode rods are 4.5 inches long (115mm), 0.5 inch in diameter (13mm), with 1/2 inch threads, and are compatible with Atwood water heaters. Use with: Atwood water heaters. Unscrew the anode rod to drain the tank. If the rod is significantly corroded, replace it with a new one. Always keep a spare in your RV. Color: Silver. Material: Magnesium Alloy and Steel. Due to different production batches, the appearance and color of the anode rod may vary from the picture, but this does not affect performance. Package Contents: 2 x RV magnesium anode rods, 1 x PTFE tape. The package includes only the items listed above; other products are not included.