Reviews About the Hydromax Bathmate Pump Bathmate Hydromax is a penis pump from Dx, a product that combines water as a sucking power tool. It is for use in the bath or shower. Bathmate is available in several versions, new models are added to the original Hydro Bathmate pump range every year. You need to check your penis size and choose the penis pump that is right for you. And, because of that, choosing the right model is very easy.