Quote:
Originally Posted by retiredguy123
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.
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How can the non potable water/Pond water that goes to the outside water bibbs mix with the potable water??
I have verified that the hose bibbs water supply is pond water.