De Dietrich 89538509 anode D33 mm, L180 mm

This article is a magnesium anode with a diameter of 33 mm and a length of 180 mm, intended for use in an enamelled hot water cylinder. Anodes of this type serve as sacrificial protection: the magnesium corrodes preferentially to the steel cylinder, preventing pitting and extending the tank life. Because they are consumed over time, such anodes are checked during regular service intervals and replaced when the remaining material falls below a safe threshold. Selection for replacement is based on the diameter of the threaded boss in the cylinder head (or side tapping) and the overall length that fits the chamber without obstructing internal components. For this particular article, the specified dimensions are 33 mm in diameter and 180 mm in length. No additional compatibility with appliance models or brand-specific applications should be assumed beyond what the De Dietrich brand marking indicates. When replacing an anode, ensure that the new one matches the original thread type (typically 5/4" or 1" BSP for common cylinders, but not stated here) and that the cylinder has been drained below the tapping level to avoid spillage. Anodes should not be allowed to seize in place; a correct application of PTFE tape or sealant is standard, but overtightening may crack the cylinder flange.