Diaphragm and Seal,25 Square In, Fits Brand Johnson Controls, For Use With Mfr. Model Number MP82, MP83, Includes One Seal, 5/8 in Internal Diameter 7/8 in. Outside Diameter 1/8 in, One Plastic Sleeve, 41/64 in Inside Diameter, One Diaphragm, 25 sq in Effective Area, For Use With MP82 and MP83 Actuators