The K-Rain RN100-ADJ Fully Adjustable Rotary Nozzle is the only rotary nozzle on the market that covers the full range from 80° to 360° in a single SKU — no tools required. Designed for residential and light commercial lawn irrigation, it delivers a consistent, multi-stream rotating pattern across a throw radius of 13 to 15 feet, making it ideal for small-to-medium lawn zones, narrow strips, corners, and irregular shapes where traditional fixed-arc nozzles fall short.
What makes the RN100-ADJ stand out in its class is a combination of features that directly improve efficiency and uniformity: matched precipitation rates that stay proportionate across all arc settings and distances, a low precipitation rate that allows water to soak into soil rather than run off, and viscous dampening technology that keeps rotation speed consistent regardless of pressure fluctuations. The multiple stream design breaks water into several fine rotating streams, improving wind resistance and reducing evaporation loss compared to traditional fan-spray nozzles. K-Rain rates these nozzles at using up to 30% less water than conventional spray nozzles, and they are eligible for conservation rebates and incentives in many areas — including certain Bay Area water districts. Click here to check if your local water district is participating.
This is the low-flow model in K-Rain's three-nozzle RN series, with a flow range of 0.19–0.77 GPM — meaning you can run more heads per zone and keep zone counts low. It uses a female-threaded (FNPT) inlet, making it a direct drop-in replacement for any existing female-thread spray nozzle on standard spray bodies. To mount onto a 1/2" male pipe thread riser or stake, use the POPNA Adapter. Need more reach? DripWorks also carries the RN200-ADJ (16'–19', Medium Flow) and the RN300-ADJ (26'–30', High Flow).
| Specification | Details |
|---|---|
| SKU (DripWorks) | MKRR10 |
| Manufacturer Part No. | RN100-ADJ |
| Brand | K-Rain Manufacturing |
| Throw Radius | 13' to 15' (3.96 m to 4.57 m) |
| Adjustable Arc | 80° to 360° |
| Radius Adjustment | Up to 30% reduction via patented flow control |
| Flow Rate | 0.19 – 0.77 GPM (varies with arc and pressure) |
| Recommended Operating Pressure | 40 PSI (2.8 bar) |
| Operating Pressure Range | 25 – 50 PSI |
| Precipitation Rate (@ 40 PSI) | 0.49 in/hr |
| Inlet Connection | Female NPT (FNPT) – fits all standard female-thread spray bodies |
| Arc Adjustment Method | Hand-adjustable, wet or dry; no tools required; visual left start and right stop indicators |
| Pop-Up Design | Double pop-up system – superior dirt and debris tolerance |
| Dampening Technology | Viscous dampening – consistent rotation speed across variable pressure |
| Stream Technology | Multiple streams – improved wind resistance and uniformity |
| Filter | Large removable inlet filter – easy to clean, prolongs product life |
| Body Material | High-impact engineered resin |
| Water Savings | Up to 30% less water vs. conventional spray nozzles |
| Flow Series | Low Flow (lowest-flow model in the RN series) |
| Color Code | Green |
| Rebate Eligible | Yes – qualifies in many water districts (including Bay Area BAWSCA) |
| Model | Radius | Flow Rate | Flow Level | Arc |
|---|---|---|---|---|
| RN100-ADJ (this product) | 13'–15' | 0.19–0.77 GPM | Low | 80°–360° |
| RN200-ADJ | 16'–19' | Medium | Medium | 80°–360° |
| RN300-ADJ | 26'–30' | High | High | 80°–360° |
What is a rotary nozzle and how is it different from a standard spray nozzle?
A rotary nozzle emits multiple slow-rotating streams of water rather than a fixed fan spray. This results in a much lower precipitation rate — meaning water is applied more slowly and has time to soak into soil rather than running off. Rotary nozzles like the RN100-ADJ are ideal for clay soils, slopes, or any area where conventional spray nozzles cause ponding or runoff. They also tend to perform better in wind because the streams are heavier and more directional than a fine mist.
What spray bodies is this nozzle compatible with?
The RN100-ADJ uses a standard female NPT thread and is compatible with any spray body that accepts a female-thread nozzle — including Hunter, Rain Bird, Toro, and K-Rain's own Pro-S and NP spray bodies. DripWorks carries a full range of compatible spray bodies to pair with this nozzle.
How do I adjust the arc?
No tools are needed. The arc is fully hand-adjustable from 80° to 360°. Visual left-start and right-stop indicators on the nozzle body allow you to set and verify the arc whether the system is running or not (wet or dry adjustment). The arc can be set to any position within that range to match corners, edges, strips, or irregular landscape shapes.
Can I reduce the throw radius?
Yes. The RN100-ADJ features patented flow control that allows the throw radius to be reduced by up to 30% — from a maximum of 15 feet down to approximately 10–11 feet — by turning the radius adjustment ring. This is especially useful when spacing heads closer than the maximum radius or fitting coverage into tighter areas.
What is "matched precipitation" and why does it matter?
Matched precipitation means the RN100-ADJ delivers the same application rate (inches per hour) regardless of the arc setting. A 90° section of lawn receives the same amount of water per square foot as a 360° section when the system runs for the same duration. This is critical for uniform coverage and healthy turf — zones without matched precipitation require different run times for each head, complicating scheduling and leading to over- or under-watering.
What is the minimum pressure needed?
The RN100-ADJ operates between 25 and 50 PSI, with 40 PSI as the recommended operating pressure for optimal uniformity and radius. At pressures below 25 PSI, rotation may slow or stop. If your system pressure exceeds 50 PSI, we recommend adding a pressure regulator to protect the nozzle and maintain consistent performance.
How do I connect this nozzle to a riser or stake?
The RN100-ADJ has a female thread inlet designed to thread directly onto any spray body that accepts a standard female-thread nozzle. To mount it on a 1/2" male pipe thread (MPT) riser or stake without a spray body, use the POPNA Adapter, available from DripWorks. See the Funny Pipe, Adapters & Swing Joints section for compatible adapters.
Is this nozzle eligible for a water rebate?
Yes. K-Rain rotary nozzles are recognized water conservation components and qualify for rebates and incentives in many areas. In California, this product specifically qualifies for rebates through certain Bay Area water districts participating in the BAWSCA program. Check here to see if your local water district is participating.
What's the difference between the RN100, RN200, and RN300?
All three nozzles share the same 80°–360° fully adjustable arc design and matched precipitation technology. The difference is throw radius and flow rate. The RN100-ADJ (this product) covers 13'–15' at low flow (0.19–0.77 GPM). The RN200-ADJ covers 16'–19' at medium flow. The RN300-ADJ covers 26'–30' at high flow for larger turf areas.
Before you install, verify the following:
Pair your K-Rain RN100-ADJ nozzles with these essential components for a fully functional, water-efficient system:
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