DIAPHRAGM Part Number Description Application MEI 122220 Diaphragm Curved Wall/Regular Type 16 Brake Chambers MEI 122310 Diaphragm Curved Wall/Regular Type 20 Brake Chambers MEI 122311 Diaphragm Deep Wall Type 20 Brake Chambers MEI 122330 Diaphragm Curved Wall/Regular Type 24 Brake Chambers MEI 122331 Diaphragm Deep Wall Various Spring Brake actuators-25/75 MEI 121651 Diaphragm Type 12 Brake Chamber MEI 121652 Diaphragm Type 30 Brake Chamber – York