15% larger than the HydroXtreme 7. The HydroXtreme 9 takes your hydrotherapy workout to a new level. It is our most powerful pump. It has the same unique globally patented design, but comes with many additions, such as a Handball pump that works in water for more Xtreme pumping perception and maximum earnings with the benefit of absolute comfort and control. If you’re serious about P.E. the new HydroXtreme 9 is the pump for you.