RV water heater anode rod. This anode rod absorbs corrosive elements caused by hot water and helps prolong the life of your water heater tank. When the anode rod is depleted, the tank may begin to rust, crack, fail, and leak. The anode rod inside your hot water tank can contribute to the production of hydrogen sulfide gas, which causes a rotten egg smell. This aluminum zinc alloy sacrificial anode rod is designed to help reduce odor issues. The RV anode rod is made of high-quality aluminum zinc alloy, measures 9.25 inches in length, features 1-inch NPT threads, and requires a 1-1/16 inch socket for installation. It fits most standard RV water heaters including models from A.O. Smith, Rheem, Richmond, State, and others that use a standard 1-inch NPT anode rod connection. It is recommended to inspect the anode rod annually and replace it when more than 6 inches of core wire is exposed at either end. Pack of 2 anode rods included. PTFE tape is included for sealing the connection (color may vary). Color: Silver + black. Material: Aluminum zinc. Diameter: 19mm. Length: 9.25 inches (approximately 235mm). Package contents: 2 x Aluminum Zinc Anode Rod, 1 x PTFE tape. Note: Light and display settings may cause slight color variations. Measurement error allowance: +/- 1-3cm.