The ride height sensors on the AccuAir e-Level kits utilize a 2 piece system which includes the actual sensor, and the plastic arm that mounts to the top. Oftentimes, a malfunctioning ride height sensor may not require the full sensor to be replaced, only the arm. Instead of having to purchase the whole sensor, AccuAir has made it very simple to replace just the arm with this direct replacement ROT-120 plastic arm replacement. This plastic arm simply bolts in place of the factory arm for a quick and easy replacement to get your air suspension system working properly again.