Air pressure regulator compatible with various MAN models, including 81521206025, 81521206003, 81521206028, 81521206004, 81521206030, 81521206029, 81521206040, A0034296244, A0004311207, A0034292844, A0004290444, 50007. It is used to maintain and control the air pressure in braking systems and other pneumatic applications. The physical dimensions of the regulator are approximately 10 cm in length, according to the scale shown in the image. This robust and durable device is essential for the safety and efficiency of commercial vehicles.