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Whether for Pressure or Vacuum, These Versatile Pumps May Be Just What You Need If you work with pressurized air or vacuum systems, chances are you've either specified or considered a pump that uses WOB-L piston technology. It's no wonder. You'll find WOB-L pumps so small that they fit in the palm of your hand, with lots of room to spare. You'll also find doublecylinder versions that require both arms and a strong back to lift. And all sizes in between. WOB-L piston pumps represent what is arguably the most versatile pressure and vacuum technology available today. Despite this versatility, however, selecting the appropriate WOB-L piston pump is not a job for the uninformed; even more basic, WOB-L technology is not necessarily the best choice for every application. Provided by: Thomas Products Div.