Checkpoint Audible Radon Mitigation System Alarm - $72 - (Luck, WI)
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Posted 1 month ago
An audible alarm is desirable when the U-tube manometer is installed in a hard to view location. The Checkpoint alarm will sound when the pressure drops below .25"WC in the vent pipe due to an obstruction or fan failure.
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From ebay.com - 1 month ago