The K-Rain RN300-ADJ is the highest-flow model in K-Rain's Fully Adjustable Rotary Nozzle series, designed for large lawn areas requiring a throw radius of 26 to 30 feet. What makes this nozzle unique among rotary nozzles is its full arc adjustability from 80° to a complete 360° — with zero tools needed. You simply adjust the arc by hand, wet or dry, using the clearly marked left-start and right-stop indicators. One SKU covers every arc pattern at this distance range, eliminating the need to stock multiple part numbers for different installations.
K-Rain's rotary nozzles are recognized water conservation components, using up to 30% less water than standard spray nozzles. Their low precipitation rate reduces surface runoff and improves soil absorption — making them an ideal upgrade for clay soils, slopes, or any area prone to pooling. The multiple stream technology delivers water in segmented streams rather than a solid sheet, dramatically improving wind resistance and distribution uniformity. A built-in patented flow control allows radius adjustment of up to 30% without changing nozzles, and the viscous dampening system ensures consistent rotation speed regardless of pressure variation.
This nozzle features a female threaded inlet, making it a direct replacement for virtually any female-thread nozzle on existing spray bodies. To mount it on 1/2" male pipe threads, use the POPNA Adapter available from DripWorks. The double pop-up system gives this nozzle superior dirt tolerance compared to single-stage designs, extending service life in sandy or silty soils. A large integrated filter further protects the nozzle's internal mechanism from clogging.
Need coverage for a smaller zone? K-Rain also offers the RN200-ADJ (16'–19', Medium Flow) and the RN100-ADJ (13'–15', Low Flow) for tighter spaces. All three models share the same installation interface and 80°–360° arc range — perfect for designing a uniform system across multiple zone sizes.
This product qualifies for rebates through certain Bay Area water districts. Click here to see if your local water district is participating.
| Specification | Details |
|---|---|
| SKU | MKRR30 |
| Manufacturer Part No. | RN300-ADJ |
| Flow Category | High Flow |
| Throw Radius | 26' – 30' (radius adjustable up to 30% via patented flow control) |
| Adjustable Arc | 80° to 360° |
| Flow Rate | 0.80 – 3.20 GPM (varies with arc angle and pressure) |
| Recommended Operating Pressure | 40 PSI (2.8 bar) |
| Operating Pressure Range | 25 – 50 PSI |
| Inlet Type | Female Thread (replaces all female-thread nozzles) |
| Arc Adjustment Method | Hand adjustable — no tools required; adjustable wet or dry |
| Pop-Up System | Double pop-up — superior dirt tolerance |
| Stream Technology | Multiple stream — improved wind resistance; large droplets reduce drift |
| Dampening System | Viscous dampening — consistent rotation speed across varying pressures |
| Precipitation Rate | Low & matched — reduces runoff, improves uniformity across all arcs |
| Filter | Large integrated filter — prolongs nozzle life |
| Water Savings | Up to 30% less water than conventional spray nozzles |
| Series Options | 3 models: RN100-ADJ (13'–15'), RN200-ADJ (16'–19'), RN300-ADJ (26'–30') |
| Brand | K-Rain Manufacturing |
What makes the RN300-ADJ different from standard spray nozzles?
Unlike a fixed spray nozzle that delivers water in a solid fan or pattern all at once, the RN300-ADJ uses rotating multiple streams to apply water slowly and evenly — similar in concept to a slow drip rather than a dump. This low precipitation rate gives water time to soak in before the next pass, dramatically reducing runoff and improving soil absorption. It also uses up to 30% less water than conventional spray nozzles for the same coverage area.
Does this nozzle require any tools to adjust the arc?
No — the arc is fully hand-adjustable with no tools required. You can set it anywhere from 80° to a full 360°, and you can make that adjustment with the system running or shut off. The nozzle features clearly visible left-start and right-stop markers so you can confirm your arc setting at a glance.
What spray bodies is this nozzle compatible with?
The RN300-ADJ has a female threaded inlet and is designed to replace virtually any standard female-thread nozzle on existing pop-up spray bodies. If your spray body has a 1/2" male pipe thread (MPT) outlet, use the POPNA Adapter (available at DripWorks) to make the connection. It is compatible with most major brand spray bodies including Hunter, Rain Bird, and K-Rain.
What is the recommended operating pressure for this nozzle?
The RN300-ADJ is optimized to run at 40 PSI, with an acceptable operating range of 25–50 PSI. At pressures below 25 PSI, rotation may be sluggish or inconsistent. If your supply pressure exceeds 50 PSI, we strongly recommend installing a pressure regulator upstream to protect the nozzle and ensure proper performance.
Can I mix the RN300-ADJ with the RN100-ADJ or RN200-ADJ on the same zone?
It is generally not recommended to mix nozzles with different flow rates on the same valve zone. Since the RN300-ADJ is the high-flow model and the RN100/RN200 are low and medium flow respectively, mixing them would create uneven precipitation rates across the zone. For best results, keep all nozzles on a single zone at the same flow level. Use multiple zones if you need to irrigate areas of different sizes.
What does "matched precipitation rate" mean and why does it matter?
Matched precipitation rate means the nozzle applies water at the same depth (inches per hour) regardless of the arc setting — whether it's set to 80° or 360°. This is critical for uniform irrigation: heads covering corners (smaller arcs) won't over-water while heads covering open areas (full circles) are still running. It eliminates wet spots and dry spots caused by mismatched precipitation.
Is this nozzle eligible for water conservation rebates?
Yes. K-Rain's fully adjustable rotary nozzles are recognized water conservation components and are eligible for rebates and incentives in many areas. Certain Bay Area water districts participate in a rebate program — check here to see if your district qualifies. Contact your local water utility for additional programs in your area.
What does the "double pop-up system" do?
The double pop-up design uses a two-stage wiper seal that keeps dirt and debris from entering the nozzle body when it retracts below grade. This is especially important in sandy, silty, or fine-soil environments where a single-stage seal can let grit inside, degrading the rotation mechanism over time. The result is a longer service life with less maintenance.
Before you install, verify the following:
Pair your K-Rain RN300-ADJ nozzles with these essential components for a fully functional, water-efficient system:
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