The Asurity® SOS-1 Safety Overflow Switch detects clogs in condensate drain lines. By locating the switch away from the normal flow, it can be used to detect drain line overflows, responding by opening the circuit to the compressor contactor. When not detecting water, the SOS-1 is normally closed and allows normal air conditioner operation. Includes primary drain pan fitting. Diversitech, SOS-1, Safety Overflow Switch, 24 V AC, 1.25 A, 2 Wires, SPST Contact Form, ABS, Gray