The VAC-U-MAX Model 1020 continuous-duty industrial vacuum features a positive displacement pump designed for the high-volume recovery of up to 5 tons/hr.; it can also be used in the recovery of heavy materials including sludges and other similar materials. The vacuum is available in 10 and 15hp versions. 
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VAC-U-MAX; 800-VAC-U-MAX; www.vac-u-max.com