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Close-up of Toro 5-309 GPM flow gauge showing the 1/4-inch MIPT threaded connection, dial face, and mounting port for irrigation systems, used to monitor gallons per minute.

Toro 5-309 Flow Gauge — 1/4" MIPT Irrigation GPM Indicator

Brand: Toro
Save 27%
$150.16
$108.87
SKU 5-309

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The Toro 5-309 GPM Flow Gauge is a dedicated irrigation flow indicator designed to help professionals and homeowners monitor system performance. Part number 5-309 fits a 1/4" MIPT port and provides a clear visual measure of gallons per minute so you can verify zoning, detect leaks, and confirm system output during installation or maintenance.

  • Part number: 5-309 — factory Toro replacement and OEM-compatible flow gauge.
  • Thread size: 1/4" MIPT (male iron pipe thread) for direct installation into compatible fittings or adapters.
  • Primary use: Measures GPM for sprinkler and drip irrigation systems to help balance zones and diagnose low-flow issues.
  • Installation: Installs into a 1/4" MIPT port or with an adapter; requires basic hand tools and standard thread sealant for a water-tight connection.
  • Maintenance: Simple visual readout with low-maintenance operation — inspect periodically and clear debris if needed.

This compact flow gauge is intended for inline use on irrigation and sprinkler equipment where a 1/4" MIPT connection is available. It gives quick, on-site confirmation of flow performance so you can commission systems faster and identify problems before they affect turf or plant health. For best results, install in an accessible location and follow standard irrigation plumbing practices — use appropriate thread sealant, avoid overtightening, and inspect seals during seasonal start-up.

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Frequently Asked Questions

What thread size and connection does this gauge use?
The Toro 5-309 uses a 1/4" MIPT (male iron pipe thread) connection for direct installation or use with adapters.
How do I install the 5-309 flow gauge?
Install into a 1/4" MIPT port with standard thread sealant. Hand-tighten and finish with a wrench—do not overtighten.
How often should I check or maintain the flow gauge?
Inspect the gauge each season and after winter start-up; clear debris and verify seals to maintain accurate readings.

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