Made from high-quality magnesium material, this magnesium anode rod helps absorb oxidizing substances and contaminants in water through electrolysis, protecting the metal water tank from rust and helping extend the life of your RV water heater. These magnesium anode rods are more effective than aluminum alternatives in attracting corrosive elements, preventing tank corrosion and increasing the longevity of your water heater. By attracting harmful minerals in the water, the anode rod sacrifices itself to protect the tank. If the rod becomes fully depleted, the tank may begin to rust, crack, fail, and eventually leak. This magnesium anode rod measures 4.5 inches (115mm) in length, has a 0.5 inch (13mm) diameter, and features 1/2 inch threads. Designed to fit standard water heaters. Recommended for use in RV water heaters. To drain the tank, unscrew the anode rod. If the rod is significantly corroded or depleted, replace it with a new one. It's advisable to keep a spare on hand. Color: Silver Material: Magnesium Alloy + Steel Note: Due to different production batches, slight variations in appearance and color may occur and do not affect performance. Package Contents: 2 x RV Magnesium Anode Rods 1 x PTFE Tape (color may vary; specific colors cannot be requested) Please note: Only the items listed are included. Other accessories shown are not part of the package. Lighting and display differences may cause slight color variations between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.