2513200158 Mercedes-Benz R Class W251 Air Suspension Valve Block Product Overview The 2513200158 is an air suspension valve block specifically designed for the Mercedes-Benz R-Class W251 and multiple same-platform models (including ML and GL). As a critical control component within the Airmatic air suspension system, it distributes high-pressure air from the compressor to each wheel's air spring as required. Through independent pressure regulation of all four wheels, it