Vacuum Breaker Hose Bib Leaking

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Many older outdoor spigots are equipped with an “add-on” hose connection vacuum breaker (HCVB), and if water is spraying out it means the rubber gasket inside has failed. The vacuum breaker prevents water from flowing backward into the house. (Vacuum breakers are built into newer frost-proof water valves.)
So, if one needs to repair a leaky vacuum breaker it is easier, more cost effective, and less time consuming to simply replace the entire hose bib itself. To do so .
Whether it's installed on a hose bibb or a sprinkler valve, an anti-siphon valve's. and break the vacuum, but it wastes water and should be repaired or replaced.
A hose connection vacuum breaker should be installed on each faucet or hose bibb that is connected to the potable water supply to prevent backflow into the water supply.
The vacuum breaker has begun to leak. This happens when the plastic cap is ruptured by freezing, this often occurs when the hose is left on the valve, or the rubber seating surface needs to be replaced. This vacuum breaker threads out of the valve, and the replacement threads into the valve.
The valve, called a vacuum breaker, is typically made of plastic, and when it wears out, water can spray from it when the faucet is on. If the faucet leaks when it's .