I’ve got the bathmate. Think it’s the Hercules one, it’s about 8 inches. I’ve had it quite a few years now. When I’m pumping I fill the whole tube and I can’t get any more water out. So I think I need to upgrade to the bigger one. Does anyone have experience with outgrowing theirs? I can’t imagine that I’d be able to pump to an even bigger size?...Or will I? 