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System Sensor Carbon Monoxide Detector 4-wire 12/24 volt C01224T Exp 6-3-2031 | eBay
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SYSTEM SENSOR CO1224T 12/24 volt, 4-wire, system-monitored C02 carbon monoxide detector w/ RealTest Technology: Amazon.com: Tools & Home Improvement
Replacing 4 wire Smoke and CO detector connected to Alarm System - DoItYourself.com Community Forums
