"The BJ Enterprises Sentry Tank Monitor with Alarm is a self-contained system that monitors most single or double walled above ground tanks to help avoid overflows or inventory shortages. 103 decibel alert siren sounds when tank hits preset, adjustable. For use with oil, waste oil, diesel fuel, antifreeze, water and other fluids with a low flash point. Not recommended for use with gasoline or other flammable liquids. U.S.A. Compatible With Single/double wall above ground tanks, Product Type Tank monitor, Fuel Type Diesel. Fill or low levels can be preset from 2in. to 10ft. Includes 6in. x 1/2in. NPT pipe that can easily be replaced in the field Siren runs for up to 4 days when activated 9V battery operation included is ideal for remote areas where AC power is not accessible Weather-resistant housing and toggle switch holds up in any outdoor conditions Pushbutton test switch with weather-resistant rubber boot assures you that the unit is in proper operating condition Simple installation and easy maintenance Also can be used for monitoring interstitial space"
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