[New Englander]

Originally Posted by photo1902

Thats a common occurrence. Take some PB Blaster penetrant. Spray the threads (or as close as you can). Let it sit for a few minutes. Using Channel Locks, twist the vacuum-breaker to the point you can access the set screw.

As other posters mentioned, use care while doing this, especially if it's on a vinyl siding house, as the hose bibb isn't always securely mounted to the wall. On most stucco/block homes, holding off the fitting isn't necessary. Once you get to the point you can drill out the screw, you'll be good. The problem with not drilling out the set screw is that it's almost a guarantee you'll screw up the threads on the hose bibb itself

I tried that already and afraid if I use more force something in the wall may break