Leakage from an RP Device
Leakage from a backflow preventer is normally attributed
to foreign matter lodging on the seating area of the internal check valve
seats. The majority of the time this can be corrected by simply flushing
the device which will dislodge any loose particles.
However, the spillage from the dump port does provide
a "warning signals that the device is in need of maintenance.The needed
service should be performed by a Certified Backflow Prevention Tester.