This AP Products Propane Leak Detector alerts to leak with bubbles and is comes in 8 ounce bottle.

General purpose leak detector for all pressurized gases. Designed to detect joint leaks within 5 Seconds of proper application at temperatures down to -40 Degree Fahrenheit. General Purpose Leak Detector For All Pressurized GasesDesigned To Detect Joint Leaks Within 5 Seconds Of Proper Application At Temperatures Down To -40 Degree FahrenheitSpray Bottle

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