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Hunter MP Rotator adjustment tool (MPTOOL) shown on a white background, compact hand tool for arc and radius control in irrigation systems.

Hunter MPTOOL MP Rotator Arc and Radius Adjustment Tool

Brand: Hunter
Save 61%
$3.38
$1.31
SKU MPTOOL
In Stock (518)

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The Hunter MPTOOL is a compact adjustment key for MP Rotator nozzles, designed to quickly change spray arc and reduce radius for precise irrigation coverage.

  • Arc adjustment: Rotate the Arc Adjustment Ring clockwise to increase arc and counterclockwise to decrease it while the nozzle is operating in the pop-up position.
  • Radius control: Turn the Radius Adjustment Screw clockwise (4 full turns) to decrease radius or counterclockwise (4 full turns) to increase radius; up to 25% reduction is possible.
  • Slip-clutch protection: Built-in slip clutch prevents over-reduction and protects the nozzle from damage during adjustment.
  • Simple compatibility: Works with all MP Rotator nozzle models; can also be used in place of a small flat-head screwdriver for adjustments.
  • Field-ready design: Lightweight, hand-held tool that makes zone tuning faster and keeps irrigation uniform and efficient.

Use the MPTOOL as part of routine system tuning: adjust all rotators on a zone for consistent precipitation rates, set proper run times, and avoid sustained pressures above 55 PSI to preserve nozzle life.

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Frequently Asked Questions

How do I adjust the arc on an MP Rotator nozzle?
Rotate the Arc Adjustment Ring while the nozzle is up and operating: clockwise increases arc, counterclockwise decreases it.
How much radius reduction can the MPTOOL provide?
The MPTOOL can reduce radius up to 25%; use four full turns of the radius screw to reach the reduction limit.
Can I adjust MP Rotators without the MPTOOL?
Yes. Adjustments can be made by hand or with a small flat-head screwdriver, but the MPTOOL makes tuning faster and easier.
Should I adjust rotators with water running?
Yes. Make arc adjustments with the nozzle in the pop-up position and operating to verify the spray sector and radius.

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