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Water Leak Detection Sensor.
D-Link Water Sensor and Alarm Starter Kit, Detector, AC Powered, Expan – D-Link Systems, Inc
120dB Water Leak Alarm Detector Sensor, EEEkit Water Leakage Sound Alarm Flood Wired Sensor Siren for Home Security, Basement, Floor, Work Alone Home Security Low Battery Alert - Walmart.com
Airthereal Water Leak Detectors, 120dB Adjustable Audio Alarm Sensor, Sensitive Leak and Drip Alert, for Kitchen