I have the 1 inch and it works for my highbanker but just barely. It would be nice to have the extra water that the 1.5 puts out. My buddy has the 2 inch and its too much water for just a highbanker. He uses it for a 2.5 dredge and still has to diver some water away because it puts out so much. In fact we have run both my highbanker and his dredge off the 2 inch before at the same time.
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I recommend this one from harbor freight. http://www.harborfreight.com/15-clear-water-pump-with-99cc-gas-engi...
I have the 1 inch and it works for my highbanker but just barely. It would be nice to have the extra water that the 1.5 puts out. My buddy has the 2 inch and its too much water for just a highbanker. He uses it for a 2.5 dredge and still has to diver some water away because it puts out so much. In fact we have run both my highbanker and his dredge off the 2 inch before at the same time.