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What is the standard flange and diaphragm material used on a 9013F pressure switch?

Product Line:
9013 pressure switches

The flange is made of Cold steel, plated with zinc iridescence chromate
The diaphragm is made of Buna N rubber. Note for a brief period they were using a white TPE Arnitel EL550 plastic. You can tell the difference by looking at the color of the diaphragm. The Buna N is Black and the TPE Arnitel is white.
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