K-Rain RPS 75 nozzle chart: radius and flow at every nozzle size
The K-Rain RPS™ 75 is a 3/4-inch gear-driven rotor with a 40°–360° adjustable arc, a 22–51 ft radius range, and a 20–70 PSI operating range. K-Rain ships every rotor with twelve nozzles in the box — eight standard-angle (26° trajectory) and four low-angle (11° trajectory) — and the #3 standard nozzle is pre-installed from the factory. Picking the right nozzle is the single biggest lever you have for matching the rotor to your zone: nozzle choice sets both the wetted radius and the flow you draw from the zone manifold. The chart below is K-Rain's official performance data, presented at 50 PSI (the most common reference pressure for residential rotor sizing).
If you're shopping the rotor itself, see the K-Rain RPS75 Rotor Sprinkler (KRN-58-1032). To change a nozzle you'll need the RPS75 / RPS75i Adjustment Key (KRN-P1000901) — it's the same tool used to set the arc. For the full K-Rain rotor lineup browse the K-Rain Rotors category page.
RPS 75 standard nozzles (40°–360° adjustable arc)
Source: K-Rain RPS 75 Setting Instructions, Part Number 16005103 Rev. 12. Trajectory: 26°. All eight standard nozzles ship with the rotor.
| Nozzle # | Radius @ 50 PSI (ft) | Flow @ 50 PSI (GPM) | Best for |
|---|---|---|---|
| #0.75 | 30 | 0.9 | Smallest zones, tight perimeter trim where you need a long-throw rotor at the lowest possible flow |
| #1.0 | 31 | 1.2 | Small residential zones; mid-range head spacing on low-flow systems |
| #1.5 | 34 | 1.6 | Standard small-to-mid residential zone with 30+ ft head spacing |
| #2.0 | 38 | 2.0 | Standard residential zone, ~35–40 ft head spacing |
| #3.0 (pre-installed) | 40 | 2.7 | K-Rain's factory default — a balanced choice for most residential zones with 40 ft spacing |
| #4.0 | 42 | 3.4 | Large residential or light commercial zones with longer throws |
| #6.0 | 43 | 4.9 | Mid-commercial zones; spacing in the 40+ ft range with healthy flow available |
| #8.0 | 48 | 6.8 | Maximum-radius applications; commercial open turf with high-flow manifolds |
RPS 75 low-angle nozzles (40°–360° adjustable arc, 11° trajectory)
Source: same setting-instructions PDF. Low-angle nozzles trade some radius for a flatter spray pattern that resists wind and clears low obstructions (fences, hedges, parked vehicles).
| Nozzle # | Radius @ 50 PSI (ft) | Flow @ 50 PSI (GPM) | Best for |
|---|---|---|---|
| LA #1.0 | 26 | 1.8 | Windy small zones; short-throw under fences or low overhangs |
| LA #3.0 | 35 | 3.5 | Mid-size zones with persistent wind or low overhead obstructions |
| LA #4.0 | 37 | 4.4 | Larger windy zones; coastal residential |
| LA #6.0 | 40 | 7.3 | Commercial windy turf; sports-field perimeters |
K-Rain also publishes performance data at 30, 40, 60, and (for the larger nozzles) 70 PSI in the same chart. Above 60 PSI, expect radius and GPM to climb 5–10% per pressure step; below 30 PSI, expect the spray to lose carry. The full operating range is 20–70 PSI, and K-Rain offers a pressure-regulated 45 PSI variant on the 6-inch RPS75 body (model option -PR) for installs where supply pressure is high or variable.
How to read the chart
The RPS 75 is designed for matched precipitation: the precipitation rate (depth of water per hour) is roughly constant across nozzles when arc is held constant. K-Rain's chart precipitation rates run from about 0.16 to 1.0 in/hr depending on nozzle and arc. The practical implication: you can mix nozzle sizes within a single zone as long as arc is consistent. A 90° corner head and a 180° edge head, both using the #3 nozzle, will deliver the same depth of water per hour to their respective footprints. Reducing arc on a fixed nozzle increases precipitation rate (the same flow lands on a smaller footprint) — K-Rain's chart precipitation values are calculated for 180° operation; halve for 360°.
How to swap an RPS 75 nozzle (3 steps)
Tool required: the RPS75 / RPS75i Adjustment Key (KRN-P1000901). The key has two ends — a flat blade (A) for the keyhole and a hex (B) for the nozzle retention screw.
- Remove the nozzle retention screw. Use the hex (B) end of the adjustment key and turn counter-clockwise. The retention screw doubles as the break-up screw that adjusts close-in spray; back it fully out to remove the nozzle.
- Pull up the riser and remove the nozzle. Insert the flat blade (A) end into the keyhole on top of the nozzle turret, turn 1/4 turn to lock, and firmly pull the spring-loaded riser up. Pull the old nozzle straight out by its prongs (needle-nose pliers help). Hold the riser with one hand while you work.
- Install the new nozzle and re-seat the screw. Press the new nozzle into the socket with the nozzle number visible and the prongs facing up. Re-install the retention screw with the hex (B) end (clockwise). Release the riser; the spring pulls it back down.
K-Rain fixed 360° rotary nozzles (separate product family)
K-Rain also makes a line of color-coded fixed-circle rotary nozzles for fixed-arc spray bodies. These are not RPS75 nozzles — they thread onto a standard spray body, deliver a full 360° pattern at a fixed radius, and are picked by color. Total Sprinkler stocks these three:
| Color | Radius (ft) | Pattern | SKU | |
|---|---|---|---|---|
 |
Light green | 13'–15' | Fixed 360° | KRN-58-1063 |
 |
Light blue | 16'–19' | Fixed 360° | KRN-58-1065 |
 |
Light grey | 26'–30' | Fixed 360° | KRN-58-1067 |
If your zone is a full circle with no obstructions, a fixed-360° nozzle on a spray body can be a cheaper, simpler choice than a full RPS75 rotor. For variable arcs (corners, edges, irregular shapes) the RPS75 is the right tool.
Keep going
The full K-Rain rotor lineup is on the K-Rain Rotors category page. For Hunter rotors and rotary-nozzle alternatives — including the Hunter MP Rotator family that pairs with PRS spray bodies — browse the Hunter brand category. Sibling nozzle charts are on the build list: Hunter I-25 Nozzle Chart and Hunter PGP Nozzle Chart are coming next.
