K-Rain RPS 75 nozzle chart: radius and flow at every nozzle size
The K-Rain RPS 75 nozzle chart below is K-Rain's official performance data at 50 PSI, the most common reference pressure for residential rotor sizing. The RPS 75 is a 3/4-inch gear-driven rotor with a 40 to 360 degree adjustable arc, a 22 to 51 ft radius range, and a 20 to 70 PSI operating range. K-Rain ships every rotor with twelve nozzles in the box: eight standard-angle at 26 degree trajectory and four low-angle at 11 degree trajectory. The #3 standard nozzle is pre-installed from the factory.
Nozzle choice is the single biggest lever you have for matching the rotor to your zone. It sets both the wetted radius and the flow you draw from the zone manifold. Shopping the rotor and parts? Browse the full lineup on the K-Rain Rotors category, or the wider K-Rain brand category for the adjustment key and nozzles.
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 degree corner head and a 180 degree edge head, both using the #3 nozzle, deliver the same depth of water per hour to their footprints.
Reducing arc on a fixed nozzle increases the precipitation rate, since the same flow lands on a smaller footprint. K-Rain's chart precipitation values are calculated for 180 degree operation. Halve them for 360 degree operation.
How to swap an RPS 75 nozzle (3 steps)
Tool required: the RPS75 / RPS75i Adjustment Key (KRN-P1000901), the same tool used to set the arc. The key has two ends: a flat blade (A) for the keyhole and a hex (B) for the nozzle retention screw. Find it on the K-Rain brand category.
- 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 degree rotary nozzles (separate 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 degree pattern at a fixed radius, and are picked by color. Total Sprinkler stocks these three:
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 spec chart: the Hunter I-25 Nozzle Chart covers the 1-inch commercial gear-drive rotor.
Every RPS 75 rotor and nozzle, shipped fast
Get the RPS75 rotor, the RPS75 / RPS75i adjustment key, and standard, low-angle, and fixed-360 nozzles in one place.
