FG100 Flow Sensor

Defend Against Leaks with Flow-Sensing Technology

Help protect your customers’ property and landscape with the FG100 Flow Sensor. Designed for residential and smaller commercial applications, the FG100 monitors irrigation and instantly identifies when there is a leak or line break so it can be addressed early. This durable flow sensor manages water efficiency, protects homeowners from potential damages and positions you as a guardian of your customers’ property and landscape—earning you a stronger reputation over time.

Now more affordable than ever, the FG100 is compatible with 18g irrigation wire for easy installation and winterization capabilities so it can stay in the ground all year. The FG100 pairs with the ESP-ME3 Controller. Now you can check system health from anywhere with the Rain Bird Mobile App—available for iPhone and Android, when adding the LNK2 module.


Flo-Watch™️: This functionality in the ESP-ME3 Controller uses information from the FG100 to learn the flow, and monitor for low or excessive flow conditions caused by broken lines or heads—saving water, protecting plants and preventing property flooding.
Winter ready: Designed to withstand high-burst pressure blowouts. Does not need to be removed during winter months.
No specialty PE-cableEasily install the FG100 with a standard 18g irrigation wire.
Threaded or slip unions: Threaded or slip unions allow for faster installation and easy maintenance.
Rain Bird App: Pair the FG100 with the ESP-ME3 Controller to check system health from anywhere, and control advanced flow settings via the Rain Bird Mobile App. Available for iPhone and Android.


1" / 25.4 mm inlet/outlet NPT/BSP/Slip
Plastic body
Paddle wheel impeller with ceramic shaft for heat dissipation
Operating Specification:
500' / 152.4 m range on standard 18g irrigation wire
Shielded wire is recommended for installations with wire runs that exceed 500' / 152.4 m, installation sites with significant wireless interference or to help protect against high-lightning locations.
Minimum Flow: 3 GPM / 11.35 LPM
Maximum Recommended Flow: 25 GPM / 94.63 LPM
Maximum Flow: 35 GPM / 132.49 LPM


Length: 9.25" / 234.95 mm
Height: 3.31" / 84.07 mm
Width: 2.56" / 65.02 mm

Model Comparison


  • FG100 1" / 25.4 mm Flow Sensor NPT
  • A83927

  • FG100 1" / 25.4 mm Flow Sensor Slip
  • A83928

  • FG100 1" / 25.4 mm Flow Sensor BSP
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