I have two irrigators W150 and Nano 310. They work very well and fit perfectly. With this product, as with another one I have purchased, I have seen some negative reviews stating that they are not suitable for certain models or that the floss turns on after the unit is turned on. I had no problems with that. **Again I will say, as in my previous review, people should CHECK the models, most of the negative reviews on this product are written by people who have INDIVIDUAL WATER MATERIALS (the ones that look like an electric toothbrush).
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