Diaphragm and Seal,25 Square In, For Use With Mfr. Model Number MP82 and MP83 Actuators, Fits Brand Johnson Controls, 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 Square Inch Effective Area, For Use With MP82 and MP83 Actuators