Brand: Hunter Industries SKU: I-20-04 Product Overview The Hunter I-20-04 is a 4-inch pop-up gear-drive rotor with an adjustable 50- to 360-degree arc, plastic riser, standard drain check valve, and 3/4-inch female NPT inlet. It is designed for residential and commercial turf areas that need longer-range coverage than a spray sprinkler while retaining the flexibility to water either part-circle or full-circle patterns from the same rotor model. The I-20 platform accepts multiple Hunter nozzle families, allowing the installer to select flow, radius, trajectory, and precipitation characteristics for the site. Across the available nozzle range, Hunter lists an operating radius of approximately 17 to 46 feet and flow from 0.36 to 14.8 GPM. Recommended pressure is 25 to 70 PSI, with an operating range of 20 to 100 PSI. Standard and low-angle nozzle options provide 25-degree and 13-degree trajectories. FloStop control allows flow through an individual rotor to be shut off while the irrigation zone remains pressurized, which can simplify nozzle changes and service. Automatic arc return helps restore the programmed pattern if the turret is forced out of position, while the non-strippable drive mechanism helps protect the internal gears. The standard check valve is designed to hold back up to 10 feet of elevation to reduce low-head drainage. Key Features 4-inch pop-up plastic riser Adjustable 50- to 360-degree arc Part-circle and full-circle operation in one model FloStop individual-head flow shutoff Automatic arc return and non-strippable drive QuickCheck arc mechanism and through-the-top adjustment Standard drain check valve for up to 10 feet of elevation 3/4-inch female NPT inlet Radius range of approximately 17 to 46 feet, depending on nozzle and pressure Flow range of approximately 0.36 to 14.8 GPM Common Uses Residential lawns and larger turf zones Commercial landscapes and common areas Sites requiring adjustable part- or full-circle coverage Replacing a compatible 4-inch Hunter I-20 rotor Compatibility and Installation Notes Select the nozzle according to the required radius, flow, trajectory, and available pressure. Use a compatible 3/4-inch swing joint or threaded connection. Set the top of the rotor level with the finished grade and allow clearance for the 4-inch riser. Use the Hunter adjustment tool or a flat-blade screwdriver as directed for radius and arc adjustment. Do not exceed the available zone flow or pressure. Confirm nozzle-package contents before ordering if a specific nozzle is required. Frequently Asked Questions Is the I-20-04 adjustable or full circle? It supports an adjustable arc from 50 degrees through a non-reversing 360-degree full-circle pattern. Does it include a check valve? Yes. The standard I-20-04 configuration includes a drain check valve rated to help prevent low-head drainage for up to 10 feet of elevation. What determines the final radius and flow? The installed nozzle, operating pressure, radius adjustment, and site conditions determine the actual performance. Why Buy from Big Frog Supply? Big Frog Supply carries Hunter rotors, nozzles, swing joints, adjustment tools, valves, and irrigation repair components for residential and commercial systems.
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