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Johnson Controls D-3153-600 Diaphragm Replacement 30067439-890 it is the correct technicalWhen you're dealing with air leaks or inconsistent damper positioning in the field, a cracked or worn pneumatic actuator diaphragm is the most likely culprit. This Johnson Controls D 3153 600 is the direct OEM replacement part engineered specifically for the D 3153 Series Pneumatic Actuator. Fabricated from a high durability synthetic elastomer, this damper actuator diaphragm provides the flexible seal necessary to convert control air pressure into