This PVB has a bad check valve. This Backflow Preventer needs repair.
This is why Backflow Assemblies are required to be inspected.
These old parts were pretty worn out and not preventing backflow incidents.
Buy Febco Repair Kit for 765 1.5″ to 2″ Check Valve, 905-070
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Backflow Preventers are Designed to be REPAIRED, Not Replaced.