What is the diameter of the top flange?
The diameter of the narrow end of the flange is 0.93" / 23.65mm.
The diameter of the wider end of the flange is 4" / 101.6mm.
![](https://www.penn-elcom.com/media/wysiwyg/M1557-M20.jpg)
![](https://www.penn-elcom.com/media/wysiwyg/M1557-M20.jpg)
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