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The data sheet that came with my foam cannon said it needed 1.8 GPM. The first electric I had only was rated for 1.4 GPM and it foamed decent but not like my 2.5GPM gas unit. It produced a much more consistent foam, thicker foam with the gas unit. I'm now looking at that electric one on Amazon that was rated at 1.8GPM. I do like electric for my cars. The gas unit scares me a bit when using it on the car as it has a much higher pressure rating.
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