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What does form VZ4 mean in relation to a 9012ACW?

What is VZ4 in 9012ACW

Product Line:

Pressure Switch

The VZ4 at the end of the 9012ACW number was a seal cap and lock nut on the range adjustment to lock that adjustment to passers-by. The GAW has all the adjustments behind the cover so VZ4 is not required. Form Z would change the connection threading, should not be used.
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