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This depends where it is. What size it is. How it is connected. What material it is.

If it is the kind that is on your hose bib they are supposed to be "Pinned" when they are installed so that you can't take them off. A small pin is screwed down through the device and locks it onto the threads. Then the head of the pin is sheared off so that you cannot tamper with it. If you still want to take it off you must drill out the pin and remove it, without damaging the hose bib threads, so that you can unscrew the back flow preventer.

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14y ago

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