If you're interested in taking your Hydromax pumping to the next level, this accessory is a must-have. The HydroVibe attaches to the bellows on your Hydromax pump to add pleasurable vibration therapy to the pumping experience. A key benefit is that the vibrations help you relax while pumping. But also, since your penis is already highly sensitized from increased blood flow, the vibrations feel phenomenal. In addition, studies have shown that the vibrations help release beneficial hormones that make you feel great when the pumping session concludes.