Depends on the size and length of the pipes you are trying to clear water from. Some folks will get by using the blower (reverse) end of the ShopVac to push water. But for some owners, they require a blower designed for such purpose with a little more power (i.e. air compressor, Cyclone). You'll know after a few minutes if the ShopVac has inadequate pressure to push-out water from your lines.
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