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I went online to and ordered exact replacements for my carbon monoxide and smoke alarms from through my local Lowe's Home Improvement store. The item numbers are 3209663 for the CO alarm (model # 1039885) and 3209662 (model # 1039883) for the smoke alarm, both of them use 9 volt batteries and are approved for RVs. Together the run about $35 and take about 5-6 days to arrive at your local store.
Amazon had the best price for the Propane alarm.
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