The largest, most effective penis pump, the Hydromax Xtreme X40 takes your hydrotherapy workout to a new level. Incorporating all the advantages of other Hydromax pumps, the Xtreme X40 also features a handball pump that also works in water. 15% larger than the X30 Xtreme, this model offers absolute comfort and control. Dimensions are 15 by 7 by 7 in.