Hunter I-25 nozzle chart: radius and flow at every nozzle size

The Hunter I-25 is a 1-inch gear-driven commercial rotor with a 40–71 ft radius range, a 50°–360° adjustable arc, and a 40–100 PSI operating range (Hunter's recommended pressure band: 50–70 PSI). It is the workhorse for sports turf, parks, large residential lots, and any zone where a 3/4" rotor runs out of throw. The rotor ships pre-set to roughly 180° arc with five standard nozzles in the box: #7 Orange, #10 Lt. Green, #15 Gray, #20 Dk. Brown, and #25 Dk. Blue. Nozzle choice is the primary lever for matching the rotor to the zone: it sets both the wetted radius and the flow drawn from the manifold. The chart below reproduces Hunter's published I-25 Standard Nozzle Performance Data at 60 PSI, the mid-point of the recommended pressure range.

Shopping the rotor body itself? The 4" I-25 Adjustable Vinyl Rotor (HUN-58-1295) is the standard residential-spec body. The I-25 with Stainless Steel Riser (HUN-58-0005) resists dirty water and high-cycle commercial use, and the 6" High-Speed I-25 (HUN-58-0086) gives faster reverse for narrow watering windows on sports turf. For the full Hunter rotor lineup browse the Hunter Rotors category page.

I-25 standard nozzles (25° trajectory)

Reproduced from Hunter's I-25 Standard Nozzle Performance Data, LIT-471 H 3/22 (current Hunter brochure) at 60 PSI. The five nozzles marked with an asterisk ship together as the I-25 Nozzle Set (HUN-581-1054); the others are stocked individually. The #5 White is the only nozzle in this list not in Hunter's current chart — it ships from the prior I-25 Plus revision (LIT-028) and remains in service on older installations; its row is sourced from that earlier chart.

Hunter publishes the full I-25 chart at 40, 50, 60, 70, 80, 90, and 100 PSI, with the range varying per nozzle (smaller nozzles bottom out at 40 PSI; #28 starts at 70 PSI and runs to 100 PSI). Above 70 PSI expect radius and flow to climb roughly 3–5% per pressure step; below 50 PSI the spray loses carry and the streams break up. For high-static-pressure mains, regulating each zone to 60 PSI at the valve gives the most consistent results.

Is there an I-25 low-angle nozzle chart?

No. Hunter publishes low-angle (12° trajectory) nozzles for the smaller I-20 and PGP Ultra rotor families, not for the I-25. If a low-trajectory pattern matters on an I-25 zone (windy site, low overhangs, near hardscape), the practical approach is to step down one nozzle size from your radius-target pick: the smaller nozzle reaches less distance into the wind and keeps the stream tighter. For zones that genuinely need a low-angle product, the I-20 is the right rotor and Hunter's I-20 Low Angle Nozzle Performance chart is the right reference.

How to read the chart

The I-25 is engineered for matched precipitation across nozzle sizes at a constant arc. The practical implication: you can mix nozzle sizes in the same zone as long as the arc is consistent. A 90° corner head and a 180° edge head, both running the #10 nozzle, will deliver the same depth of water per hour to their footprints. Reducing arc on a fixed nozzle increases precipitation rate (the same flow lands on a smaller footprint); Hunter's published precipitation values are calculated for 180° operation, so halve for 360° heads. When sizing a zone, add the GPM of every head in the zone and confirm the manifold and lateral can carry the total flow at 65 PSI dynamic.

How to swap an I-25 nozzle (3 steps)

Tool required: the Hunter rotor adjustment key (the same flat-blade / hex tool used for arc adjustment on every I-series rotor). Keep it on the truck.

1. Lift and lock the riser. Insert the flat blade end of the adjustment key into the keyhole on top of the nozzle turret. Turn 1/4 turn to lock, then firmly pull the spring-loaded riser straight up. Hold the riser with one hand while you work — releasing it lets the spring retract the riser into the body.
2. Loosen the radius-reduction screw and pull the old nozzle. Use a flat-head screwdriver or the hex end of the adjustment key on the small screw on the front of the turret. Back the screw out 2–3 full turns; this doubles as the close-in spray break-up adjustment, and backing it off frees the nozzle. Grip the nozzle by the prongs (needle-nose pliers help) and pull it straight out of the socket.
3. Install the new nozzle and re-set the screw. Press the new nozzle into the socket with the nozzle number visible and the prongs facing up. Re-tighten the radius-reduction screw to a snug stop (do not over-torque; the screw is plastic-threaded). Release the riser; the spring pulls it back into the body. Run the zone and verify the spray pattern.

I-25 nozzles in stock by color

The six color-coded I-25 nozzles stocked individually at Total Sprinkler. Radius and flow shown at 60 PSI (or the lowest pressure Hunter publishes for that nozzle, noted where it applies):

	Nozzle	Color	Radius / GPM	SKU
	#4	Yellow	42' / 4.7 GPM @ 60 PSI	HUN-581-1093
	#5 (legacy)	White	45' / 5.3 GPM @ 60 PSI (LIT-028)	HUN-581-1142
	#8	Lt. Brown	50' / 9.2 GPM @ 60 PSI	HUN-581-1122
	#13	Lt. Blue	54' / 12.3 GPM @ 60 PSI	HUN-581-1121
	#18	Red	59' / 15.7 GPM @ 60 PSI	HUN-581-1143
	#28	Black	68' / 26.9 GPM @ 70 PSI	HUN-581-1145

The five mid-range commercial sizes (#7 Orange, #10 Lt. Green, #15 Gray, #20 Dk. Brown, #25 Dk. Blue) ship together in the I-25 Nozzle Set (HUN-581-1054), which matches the 5-pack that comes with every new I-25 rotor.

Keep going

The full Hunter rotor lineup is on the Hunter Rotors category page. For the 3/4" gear-drive equivalent, see the K-Rain RPS 75 nozzle chart.