Super Max 8900C-840 WS Pressure WasherPrice excludes freight. The Super Max 8900C 840 WS is a highly powerful cold water wet sand blaster pressure washer ideal for commercial and industrial applications that would benefit from a high pressure (4000 psi) and flow rate (3. 5 GPM). Powered by a 10 HP gasoline engine, the 8900C 840 has capabilities that extend beyond the contaminant removal ability of normal pressure washers. This wet sand blaster pressure washer machine actually removes a