It fits and it works but quality is not as good as Waterpik.
The tube looks like it can break easily so I hope it will last at least a year. When I installed it, the handle button is facing the Waterpik container -  it makes no difference since water still comes out, but it just looks weird.<br /><br />The water pressure from the WyFun tube is not as strong as Waterpik tube.  Something about the inner design of the tube could be affecting the water pressure. I turned the dial all the way to 10 on the WyFun tube and the water pressure feels like a 7 when I had my Waterpik tube.<br /><br />Oh well, if Waterpik has designed their tube better then I wouldn't need a replacement.
Rating: 3 stars