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Double-Duty Alarm. Detects both gas leaks and CO gas simultaneously 12 Volt power means no missing or dead batteries to replaceUpgrades single 12 Volt Propane Gas alarms to a dual alarm that detects both Propane Gas and COModel 35-742 flush mount can replace Safe-T-Alert LP Gas alarm 30-442 models and CCI Controls models 7770 & 7773 without modificationsModels with Solenoid Kit Include: Valve, alarm and built in relay to control the solenoid valve. Shuts off gas if a leak is detected. Standard 3/8" NPT.