This water shut off makes it possible to shower and turn the water on or off at will with a simple push of a button. Screws directly onto the base of your shower head and does not leak a drop. I have used one for about six years and it works just as well today as the day I bought it.
A shut off switch should indeed shut the flow of water off. At least that is my understanding of a shut off switch, maybe I'm am wrong. When I received the product, the packaging states this will not completely stop the flow of water...huh...what is the purpose of the shut off switch then. I really thought that they were kidding so I tried it, yep they were right, it does not stop the flow of water completely.