The Hydromax Series (Hydromax X-series) is the next stage of Hydro Pump evolution. Developing the innovative Bathmate, the new bellows pump and valve give 35% more power than the original hydro pump with more safety and comfort. Benefits: Helps to increase your penis length and girth | Instantly visible results | Harder and stronger erections | Helps you last longer in bed | High quality materials and patented technology | Completely safe to use. Bathmate Hydromax5: Suitable for users measuring 3 to 5 inches when erect, the Hydromax5 is an excellent starter model. With Bathmate hydropumps typically having better results for penises of this size, you can expect real gains using the Hydromax5.