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What does the additional suffix ``7`` on ZB2B or ZB4B operator reference number mean?

How do we get a black metal bezel for the XB4/ZB4 line?

Product Line: 
22mm Harmony push Buttons

North American Products

The ``7`` added to the catalog number means this switch comes with a black metal bezel instead of a chrome metal bezel.
Some are already obsolete and if the parts are still good, they have a long lead time.
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