Extends the life of a water heater by attracting in the water. The anode rod absorbs the action acused by hot water and prolongs the life of your water heater tank. Made using high-quality magnesium-. magnesium-rod oxidizing substances and all the contaminants in the water towards itself by electrolys, preventing the water tank from rusting in the metal water tank, ensuring your RV water heater lasting use. These magnesium anode rods are 9.15inch long/235mm, 0.71inch diameter/18mm, 3/4inch NPT threads,fits for 232767 water heater anode rod. Unscerw the anode rod to drain the tank. If the rod is mostly eaten , replace with a new one. Always keep a spare in your RV. Colour:silver + black :Magnesium + Steel Different batches, the appearance and color of the anode rod may be different from the , which does not affect Package Contents: 2 x RV magnesium anode rods 1 x tape (the color of the tape is random, 't accept the specified color) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.