“I'm not an engineer but what I had no longer seemed, NO that wasn't working properly. No names, but what I had looked like an air chamber would make it work better. I was prepared to put an air chamber under the new one until I got a good look at it. If it works the way I think it does the movement of the water is needed. It quickly removed the air and looks very, very, well made. Be VERY careful about that hot water and drain the area you are working with. Ray”