2 Pack 1/2 inch NPT RV Water Heater Anode Rod with Tape – Magnesium Anode Rod for Heaters 11553 Made from high-quality magnesium material, this anode rod attracts oxidizing substances and contaminants in the water through electrolysis, helping prevent rust in the metal water tank and extending the life of your RV water heater. These magnesium anode rods are more effective than aluminum ones at attracting corrosive elements, providing better protection against corrosion and prolonging the lifespan of your water heater. Extends the life of a water heater by sacrificing itself to corrosion. If the anode rod becomes depleted or fully decayed, the water heater tank may begin to rust, crack, fail, and leak. Each magnesium anode rod measures 4.5 inches long (115mm), 0.5 inch diameter (13mm), with 1/2 inch NPT threads. Designed to fit compatible water heaters. To drain the tank, unscrew the anode rod. If the rod is significantly corroded or worn, replace it with a new one. It's recommended to keep a spare on hand. Color: Silver Material: Magnesium Alloy + Steel Note: Due to different production batches, the appearance and color of the anode rod may vary slightly from the image, but this does not affect performance. Package Contents: 2 x RV Magnesium Anode Rods 1 x Thread Seal Tape (color may vary; specific color requests cannot be accommodated) Note: Light reflection and differences in display screens may cause slight variations in the color shown in the image compared to the actual item. Measurement error allowed is +/- 1-3 cm.