Brand: Hunter Industries SKU: I20-04-SS
Product Overview
The Hunter I20-04-SS is the stainless-steel-riser version of the 4-inch I-20 gear-drive rotor. It combines a 4-inch pop-up height, 3/4-inch female NPT inlet, adjustable 50- to 360-degree arc, standard drain check valve, and stainless riser sleeve for added durability in areas exposed to frequent traffic or demanding site conditions. Part-circle and full-circle operation are built into the same rotor, reducing the need to stock separate models for different arc requirements.
The final radius and flow depend on the installed Hunter nozzle and operating pressure. Across the compatible I-20 nozzle range, Hunter publishes approximately 17 to 46 feet of radius and 0.36 to 14.8 GPM. Recommended pressure is 25 to 70 PSI, with an operating range of 20 to 100 PSI. Standard nozzles provide a 25-degree trajectory, while low-angle nozzles provide a 13-degree trajectory for sites where a lower stream is helpful.
FloStop allows the installer to stop flow through the individual rotor while the rest of the zone remains operating. Automatic arc return helps restore the set pattern after the turret is moved, and the non-strippable drive helps protect the internal gear mechanism. A standard check valve holds back up to 10 feet of elevation to help reduce low-head drainage.
Key Features
- 4-inch pop-up with stainless-steel riser
- Adjustable 50- to 360-degree arc
- Part- and full-circle operation in one rotor
- FloStop individual-head shutoff
- Automatic arc return and non-strippable drive
- QuickCheck arc adjustment
- Standard check valve for up to 10 feet of elevation
- 3/4-inch female NPT inlet
- Approximate 17- to 46-foot radius range
- Approximate 0.36- to 14.8-GPM flow range
Common Uses
- Residential and commercial turf irrigation
- High-traffic landscape areas
- Sites where a stainless riser is preferred
- Replacing a compatible 4-inch stainless I-20 rotor
Compatibility and Installation Notes
- Select a compatible Hunter I-20 nozzle for the required flow, radius, and trajectory.
- Use a compatible 3/4-inch swing joint or threaded fitting.
- Install level with the finished grade and provide clearance for full riser movement.
- Adjust the arc and radius according to Hunter instructions.
- Confirm nozzle-package contents if a specific nozzle is required.
Frequently Asked Questions
What is the difference between I-20-04 and I20-04-SS?
Both are 4-inch I-20 rotors, but this model uses a stainless-steel riser sleeve instead of the standard plastic riser.
Does this model include low-head drainage protection?
Yes. The standard configuration includes a check valve designed to hold back up to 10 feet of elevation.
Why Buy from Big Frog Supply?
Big Frog Supply carries Hunter I-20 rotors, replacement nozzles, adjustment tools, swing joints, valves, and irrigation repair parts.
Product Type Adjustable gear-drive rotor
Manufacturer Model I-20-04-SS
Store SKU I20-04-SS
Riser Stainless steel
Arc Range 50°–360°
Radius Range 17–46 ft depending on nozzle and pressure
Flow Range 0.36–14.8 GPM
Recommended Pressure 25–70 PSI
Operating Pressure 20–100 PSI
Nozzle Trajectory 25° standard; 13° low angle
Check Valve Standard; up to 10 ft elevation
Inlet 3/4" female NPT
Flow Shutoff FloStop
