I did not install these and now one is leaking. How do you remove it from the hose bib? Was thinking it was just screwed on but it just spins. I think it says watts 8P on it.
I had issues with a different brand. It was held in place with Red Loctite. I had to heat it with a torch to get it off. The ones with a set screw may have a set screw designed to break off. If that is the case, you may have to saw a slit in the backflow prevented across the set screw. Be careful not to saw into the threads. Split the backflow preventer at the slit with a screwdriver. You should then be able to remove it.