| 摘要 |
An operator for an air flow control device includes a button mounted on a plunger. The button is indexable at forty-five degree increments on the plunger. The button has a non-circular label area that is adapted to receive a non-circular label for the operator so as to present either a diamond shape or an octagon shape to a viewer of the button. The button can have either a snap fit or a threaded connection to the plunger.
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