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Identifying a Backflow Preventer and Master Valve in a Sprinkler System

Photo of "Neptune" Box; Brass Device "800 M4 Watts Regulation"

Neptune box

Neptune box

The brass device is a Watts 800 M4 backflow preventer (required, annual test).
The black sheathed cable is the controller wire to the valves.
If a booster pump exists, this backflow type is incorrect (doesn’t protect against back‑pressure).
If the master valve solenoid is bad, the whole system fails. Check/replace it.

Pipes

Pipes

Irrigation: Rain Bird to Orbit Controller – Master Valve Wire on Old Unit; Rain Bird 6-Zone System: No Water Despite Controller Countdown; Pump Runs But No Water: Green Wire Mystery in Valve Box; Rain Jet RJC-6A "M" Terminal Purpose—Master Valve or Pump Start; Hydrotek 4000 Low Pressure Daytime—K-Rain Timer Solenoid or Supply; Irrigation Pump Runs But No Water at Valves—Master Valve or Pump Relay; Well Pump Losing Prime: Diagnosing a Faulty Check Valve; Two Controllers, One Master Valve – Wiring Without Relay; Resolving "Master Valve" Errors on Irritrol Controllers; Intermittent Master Valve Fault on Toro Ecxtra Controller

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