Take your hydrotherapy to a whole new level with the worldandrsquo;s most powerful penis pump. Advancing Hydropump design to a new level, with a new valve and detachable handball, the Hydroxtreme-Series is the Hydropump for the man who is serious about getting the very best from his pump. The Hydroxtreme5 is designed for a user whose penis is 3-5 (7.5-12.5cm) when erect.