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Does the XMLF250D2039 pressure switch require an ``O`` ring for sealing the SAE 7/16-20 UNF port connection?

No. The SAE 7/16-20 UNF female connection is design to be used without an O-ring. It has a 45 degree angle at the end of the threads for sealing the male connection.

CTA-ID : 2015328
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