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the number of batts you choose is personal preference 48v per pump is a sensible amount for a serious clowner, 36v per pump is sensible for a nice street cruiser but professional or comp ? well depending on the manufacturer you need to look at what motors are bolted to your pumps rather than what pump type they are, competition motors generally can withstand higher voltage for longer than a street motor because they have better bushings inside, but i've never heard of a 'professional' pump so i'm guessing its just a marketing name or ploy !?
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