Description: Function: Magnesium Anode Rod Protects your RV water heater from corrosion, prolonging its life.Material: Made of environmental protection magnesium alloy. Magnesium construction is softer and more absorbent than steel.Application: Magnesium rod is mainly used for water heater, heat exchanger, evaporator, boiler, etc.Replacement Parts: Great replacement of the old one. Inspect regularly, rods should be replaced yearly or when the corrosion has eaten approximately 75% of the rod's ma.Easy Use: Measures about 13x115mm/0.5x4.5inch, Uses 1/2inch NPT Thread, easy to install.Specification:Material: Magnesium alloyColor: SilverSize(DxL): About 13x115mm/0.5x4.5inchPipe Thread: 1/2inch NPT ThreadQuantity: 2pcs/packPackage includes:2pcs x Magnesium Anode Rod1pc xtapeNote:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow 1-2 cm differences due to manual measurement.