I drilled the set screw off with a Greenlee Drill bit. It took 10 seconds. Try not to damage the hose bib threads. Even if you nick the threads-- it's no big deal, as the threads do not create the seal between the Back Flow valve and the hose bib. The threads only hold the Back Flow valve to the Bib. The washer inside the new Back Flow valve creates the seal. When you screw on the new Back Flow Valve, tighten the set screw-- just don't snap off the head of the set screw, like the Builder did. BTW-- it's actually called a "Vacuum Breaker". Here it is at Lowe's for $6.98: AMERICAN VALVE Sillcock Brass Mght 3/4-in Vacuum Breaker
AMERICAN VALVE
Sillcock Brass Mght 3/4-in Vacuum Breaker
Model #MVB 3/4
Good Luck.
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