Some outdoor faucets have a vacuum breaker that helps protect the water supply against backflow. A brief release as the faucet shuts off can occur on some designs. A continuing spray from the cap while the faucet is open is a useful symptom to report.
Locate the water before assuming the hose is leaking
Note whether water comes from the cap, the hose connection, or behind the wall. Tell the plumber if the spray starts only with a hose nozzle attached or whether it happens with the outlet open. If you see moisture inside the wall, leave the faucet off.
Keep the backflow device in place
Share a photo of the faucet and any markings. A technician can identify the device and assess whether the cap assembly or the faucet needs service. The repair should preserve the fixture’s backflow protection.
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