This brush meets the specifications for use with any outdoor boilers with tubes that measure 1.75" in diameter. This includes model GX15 and GX30.
For cleaning instructions of the GX series furnaces, see the video at this link:
GX10 Cleaning Instructional Video
Please note: Do not turn this brush "counter-clockwise". Doing so may cause some of the brush bristles to fall out.
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One of the most important steps in prolonging the life of your outdoor boiler is to ensure that the water in your boiler is not corroding the steel. Water starts to eat holes in steel immediately upon contact (through rust corrosion) unless properly treated. We test your outdoor boiler water for free!