All outdoor faucets even frost free ones have compression valves and when one of these wears out water will leak from the spout.
Outdoor faucet pressure relief valve leaking.
This can be done by hand in most cases.
An anti siphon valve normalizes the pressure inside the pipes when you turn off the water to prevent it from flowing backward.
Water pressure regulators pex water pressure regulators irrigation pressure control stainless steel bell reducer with 1 1 2 inch female pipe thread and 1 inch female pipe thread.
In 99 percent of the cases the problem is a worn washer at the.
Unscrew the plastic cap covering an anti siphon valve permanently installed inside a frost free spigot or other outdoor faucet.
Turn off the water to the exterior faucet by locating the valve inside the house and closing it or the main water valve.
When installed on an outdoor faucet the valve also allows residual water in the faucet to drain which prevents faucet and pipe damage from frozen water in winter.