Black Hunter I-20 sprinkler with blue nozzle
Black Hunter I-20 sprinkler with blue nozzle
Hunter I-20 sprinkler watering grass beside flowers
Hunter I-20 sprinkler watering grass beside flowers
Rack of blue and grey Hunter sprinkler nozzles
Rack of blue and grey Hunter sprinkler nozzles
Black Hunter I-20 sprinkler with blue nozzle
Hunter I-20 sprinkler watering grass beside flowers
Rack of blue and grey Hunter sprinkler nozzles

HUNTER I-20 PLASTIC 100MM POP-UP SPRINKLER - BOX OF 20

Hunter I-20 plastic 100mm pop-up sprinkler for lawn reticulation and commercial turf irrigation. Tough body construction and a protective rubber cover support dependable operation. FloStop lets you stop water at one sprinkler for servicing, while the built-in check valve reduces drainage through lower heads after watering. Automatic arc return and a non-strippable drive help protect the watering pattern and mechanism.

The Hunter gear drive adjustment tool is required for arc adjustment and is also used for nozzle installation and radius adjustment.

✓ Inlet: 20mm (3/4") BSP female
✓ Coverage: 7.3–14 metre radius with the supplied nozzle options
✓ Spray Pattern: Adjustable 50°–360°
✓ Recommended Pressure: 170–450 kPa
✓ Flow: 4.5–36.9 L/min across the supplied nozzles at 170–450 kPa
✓ Riser: Plastic
✓ Pack Quantity: 20 sprinklers
✓ Pop-Up Height: 100mm (4")

For shorter watering distances, the black short-radius nozzle rack provides a 4.9–7.6 metre radius across nozzle and pressure options.

A replacement riser seal is available for servicing PGP Ultra and I-20 sprinklers.

Hunter I-20 Gear Drive Sprinkler Specifications
Hunter I-20 Nozzle Performance Guide

More Information
Product Specifications
Black Hunter I-20 sprinkler with blue nozzle
HUNTER I-20 PLASTIC 100MM POP-UP SPRINKLER - BOX OF 20
Black Hunter I-20 sprinkler with blue nozzle
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Black Hunter I-20 sprinkler with blue nozzle
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Hunter I-20 sprinkler with stainless steel riser and blue nozzle
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Hunter I-20-04 gear drive sprinkler with a plastic riser and 100mm pop-up height for lawn and commercial turf irrigation. Its sturdy plastic body and tough rubber cover suit demanding use.

Automatic arc return restores the chosen watering pattern if the turret is turned out of position, while the non-strippable drive helps protect the internal mechanism if it is turned against its normal direction of travel.

The supplied nozzles cover a 7.3–14 metre radius across the recommended 170–450 kPa pressure range. Radius is the distance from the sprinkler to the outer edge of the watering pattern. Blue standard nozzles produce a 25° stream and grey low-angle nozzles a 13° stream.

The spray arc adjusts from 50° to 360°. The top adjustment screw lets you shorten the watering distance using a Hunter Gear Drive Adjustment Tool or a flat-blade screwdriver. Choose the nozzle for both watering distance and arc so sprinklers on the same zone apply water at similar rates.

The Hunter gear drive adjustment tool is required for arc adjustment and is also used for nozzle installation and radius adjustment.

FloStop lets you stop water at this sprinkler for nozzle changes and servicing without shutting down the whole zone. The built-in check valve helps prevent drainage through lower heads after watering, holding back up to 3 metres of elevation.

Each sprinkler has a 20mm (3/4") BSP female inlet and comes with eight blue standard nozzles and four grey low-angle nozzles. Supplied as a box of 20 sprinklers.

The overall body height is 190mm when retracted.

Warranty: Five years.

For shorter watering distances, the black short-radius nozzle rack provides a 4.9–7.6 metre radius across nozzle and pressure options.

A replacement riser seal is available for servicing PGP Ultra and I-20 sprinklers.

Hunter I-20 Gear Drive Sprinkler Specifications
Hunter I-20 Nozzle Performance Guide

✓ Product Type and Application
Hunter I-20-04 gear drive pop-up sprinkler for lawn reticulation, commercial landscapes and turf irrigation.

✓ Dimensions and Connection
20mm (3/4") BSP female inlet.
Plastic body with plastic riser.
Pop-up height: 100mm (4").
Overall body height when retracted: 190mm.
Exposed top diameter: 45mm.
Factory-installed rubber cover.

✓ Pack Quantity
Box of 20 sprinklers of this model.

✓ Coverage and Spray Pattern
Radius: 7.3–14 metres across the supplied blue standard and grey low-angle nozzles at 170–450 kPa, before radius reduction.
Radius is the distance from the sprinkler to the outer edge of the watering pattern.
Spray arc: Adjustable 50°–360°, providing part-circle and full-circle watering in the same sprinkler.
Separately available black short-radius nozzles cover 4.9–7.6 metres across their nozzle and pressure options.

✓ Pressure & Flow
Recommended operating pressure: 170–450 kPa.
Operating pressure range: 140–700 kPa.
Flow across the supplied blue and grey nozzle options at 170–450 kPa: 4.5–36.9 L/min.
See ‘Precipitation Rate’ below for how the arc setting affects the amount of water applied across the area.

✓ Nozzles and Performance
Eight blue standard nozzles: 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 and 8.0.
Four grey low-angle nozzles.
The flat-top nozzle design allows insertion into the nozzle socket.
Hunter Gear Drive Adjustment Tool and black short-radius nozzle racks sold separately.
Standard nozzle trajectory: 25°. Low-angle nozzle trajectory: 13°.

Supplied blue standard and grey low-angle nozzles.
Example comparison at 300 kPa, before radius reduction:
Blue 1.5 nozzle: 9.8 metre radius; 5.9 L/min.
Blue 2.0 nozzle: 10.4 metre radius; 7.2 L/min.
Blue 2.5 nozzle: 10.7 metre radius; 8.9 L/min.
Blue 3.0 nozzle: 11.6 metre radius; 11.4 L/min.
Blue 4.0 nozzle: 12.2 metre radius; 15 L/min.
Blue 5.0 nozzle: 12.8 metre radius; 19 L/min.
Blue 6.0 nozzle: 13.1 metre radius; 22.7 L/min.
Blue 8.0 nozzle: 13.4 metre radius; 30.2 L/min.
Grey 2.0 LA nozzle: 8.2 metre radius; 7.4 L/min.
Grey 2.5 LA nozzle: 9.4 metre radius; 9.8 L/min.
Grey 3.5 LA nozzle: 10.1 metre radius; 12.5 L/min.
Grey 4.5 LA nozzle: 10.1 metre radius; 15.5 L/min.

✓ Radius Adjustment
The top adjustment screw lets you shorten the watering distance. Adjust it with a Hunter Gear Drive Adjustment Tool or a flat-blade screwdriver.
Use the nozzle size to establish the required coverage and flow, then make the distance adjustment.

✓ Arc Adjustment and Drive Protection
Set the arc using the top adjustment socket and a Hunter Gear Drive Adjustment Tool.
Automatic arc return restores the original arc setting if the turret is moved out of position.
The non-strippable drive protects the mechanism if the turret is turned against its direction of travel.

✓ Sprinkler Spacing
Spacing is the distance between neighbouring sprinklers.
For head-to-head coverage, each sprinkler throws water far enough to reach the next sprinkler. This overlap helps water the area between them evenly.
Use the actual watering distance after adjustment when planning the spacing.
A square layout places sprinklers on a square grid. A triangular layout uses staggered rows.

✓ Precipitation Rate
Precipitation rate describes how quickly water is applied across the area, measured in millimetres per hour.
For example, with the blue 3.0 nozzle at 300 kPa, a 180° half-circle arc and sprinklers spaced 11.6 metres apart:
Square layout: 10 mm/hour.
Triangular layout: 12 mm/hour.
At the same pressure, the same nozzle uses essentially the same flow whatever the arc setting. A smaller arc concentrates that water over a smaller area.
Different nozzle sizes can help balance watering between smaller and larger arcs, but they also change the watering distance. Choose nozzles that maintain head-to-head coverage; changing nozzle size alone may not suit an existing layout.
Where suitable nozzle combinations cannot provide similar watering rates, put sprinklers with different watering rates on separate zones so their run times can be set independently.

✓ FloStop Flow Control
FloStop stops the water at the individual sprinkler for nozzle changes and servicing without shutting off the whole irrigation zone.

✓ Drain Check Valve
Built-in check valve holds back up to 3 metres of elevation to help prevent low-head drainage after the zone switches off.

✓ Identification
Model: I-20-04.
04 identifies the 4-inch pop-up model.

✓ Warranty
Five years.

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