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Is there a difference between a PNV-8921 and an MK-8921?

Issue:
Is there a difference between a PNV-8921 and an MK-8921

Product Line: 
Valves and Actuator

Environment:
Maintenance

Cause:
Replacement

Resolution:
There is no difference between the two actuators, except the PNV-8921 is a part number designated when the factory assembles the actuator to a valve body, whereas the actuator MK-8921, is sold for replacement only.
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