1Application: Fit for almost all RV hot water heaters with 3 or 4in NPT Anode Rod Connection, suitable for Suburban, for MorFlo RV water heaters. 2Stable Performance: The magnesium anode rod helps prolong the life of your water heater tank, maintaining the good condition of the RV water heater tank. 3Reliable Protection: By effectively preventing rust, the anode rod offers reliable protection for your water heater, also ensures consistent and efficient hot water supply. 4Magnesium Alloy Material: Water heater anode rod is made from magnesium alloy, providing superior resistance to rust and ensuring its long lasting performance. 5Simple to Install: With its simple installation process, you can easily maintain your water heater's performance without the need for professional assistance or complicated procedures. Item Type: Water Heater Anode Rod Material: Magnesium alloy Magnesium Rod: Approx. 21 (diameter) x 235mm (length) or 0.83 x 9.25in Thread: 3 or 4in NPT Application: Almost all RV hot water heaters with 3 or 4in NPT Anode Rod Connection Example: for Suburban, for Mor-Flo RV water heaters 1 x Water Heater Anode Rod