Quote:
Originally Posted by MandoMan
They have set screws? I removed one for a friend last month using a couple locking pliers. I didn’t see a set screw, but if there was one that broke off, no wonder it was so hard to unscrew. Are these required. I figured the back flow preventer was on there because she used to have a hot tub that got water from that hose bib.
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They are required by the Plumbing code for all outside hose bibbs. The purpose is to prevent a negative pressure in the line from contaminating the potable water system in the house. The set screw is designed to make the device non-removable.