Air pressure switch DL5E-1P32Z as replacement for Dungs differential pressure switch LGW 3 A1H (0.8 mbar) with cover housing, fixed setting 2.5 mbar, e.g. for Viessmann. Pmax = 300 mbar, T= -20/+80°C, IP20, U=250VAC, I=0.005-5A. Fixing pin on the underside.
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