SOR 107AL-N12-P1-F0A-X Low Differential Pressure Switch By wayne No Comments on SOR 107AL-N12-P1-F0A-X Low Differential Pressure Switch 3 Min Read Buy the SOR 107AL-N12-P1-F0A-X low differential pressure switch. This unit features a NEMA 4 weathertight housing and SPDT contacts for HVAC.