WaterPik WP-660C You are done there is an on/off switch on the factory handle that you move up and down. With this replacement, the hose will start spraying as soon as you turn on the machine. It can only be turned off by pressing the button on the handle OR by turning off the machine. From a human factor point of view, this is not so intuitive. But it's functionally equivalent. This is a good inexpensive replacement with less functionality.
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