Hunter PGP nozzle chart: radius, flow, and trajectory by nozzle
The Hunter PGP and PGP Ultra are gear-driven 3/4-inch rotors with a 40°–360° adjustable arc. Hunter has shipped the PGP since 1982; the Ultra is the current production body, with a redesigned gear drive and a 4-inch pop-up height. Both share the same nozzle interface, so any of Hunter's three PGP nozzle racks fits any PGP rotor (including original 1982-spec heads). Nozzle choice is the single biggest lever for matching the rotor to a zone, since it sets both the wetted radius and the flow drawn from the manifold. The chart below is Hunter's published performance data at 45 PSI, the standard reference pressure for residential rotor sizing.
If you're shopping the rotor body, see the Hunter PGP Ultra 4-inch (HUN-58-1350) and the 12-inch shrub PGP Ultra (HUN-58-0031). The original-spec Hunter PGP-ADJ 4-inch (HUN-58-0032) is still in stock for retrofit work. To change nozzles you'll need the PGP Blue Standard rack (HUN-581-1080). The Blue rack ships separately; the rotor itself ships factory-installed with a Red Standard nozzle. Browse the full lineup on the Hunter Rotors category page.
PGP Blue Standard nozzles (25° trajectory)
Source: Hunter PGP Blue Standard Nozzle Performance Data, publication LIT-408, P/N 703300, 4/07. The Blue rack carries eight nozzles, numbered by their nominal flow at 45 PSI: the nozzle number equals the GPM at the design pressure, Hunter's modern identification system replacing the older 1-through-12 Red ordinal scheme.
| Nozzle # | Color | Trajectory | Radius @ 45 PSI (ft) | Flow @ 45 PSI (GPM) | Best for |
|---|---|---|---|---|---|
| 1.5 | Blue | 25° | 31 | 1.5 | Small residential zones, low-flow manifolds |
| 2.0 | Blue | 25° | 34 | 2.0 | Small-to-mid residential zones; tight side yards |
| 2.5 | Blue | 25° | 35 | 2.5 | Standard small residential; 30+ ft spacing |
| 3.0 | Blue | 25° | 38 | 3.0 | Standard mid residential; 35-ft head spacing |
| 4.0 | Blue | 25° | 40 | 4.0 | Mid residential; the most common drop-in choice |
| 5.0 | Blue | 25° | 42 | 5.0 | Large residential, light commercial |
| 6.0 | Blue | 25° | 43 | 6.0 | Long-throw residential; commercial open turf |
| 8.0 | Blue | 25° | 44 | 8.0 | Maximum-radius commercial; high-flow zones |
PGP Red Standard nozzles at 50 PSI (25° trajectory, legacy numbering)
Source: same Hunter LIT-408 publication. Red is Hunter's original PGP nozzle numbering system. The Red rack carries twelve nozzles, numbered 1 through 12 (the number is an ordinal, not a flow rate). Every PGP-ADJ rotor ships from the factory with a Red Standard nozzle pre-installed. Hunter offers variants pre-installed with any Red size from #1 to #12; the TS-stocked HUN-58-0034 ships with the #7. Use this table when servicing a head whose rack predates the Blue redesign, or when you need a finer step between sizes than the Blue rack offers. Values are Hunter's published 50 PSI column (Hunter does not publish a 45 PSI column for Red; the Red chart runs at 30, 40, 50, and 60 PSI).
| Nozzle # | Color | Trajectory | Radius @ 50 PSI (ft) | Flow @ 50 PSI (GPM) |
|---|---|---|---|---|
| #1 | Red | 25° | 29 | 0.7 |
| #2 | Red | 25° | 30 | 0.9 |
| #3 | Red | 25° | 31 | 1.2 |
| #4 | Red | 25° | 34 | 1.6 |
| #5 | Red | 25° | 38 | 2.0 |
| #6 | Red | 25° | 38 | 2.7 |
| #7 (common factory pre-install) | Red | 25° | 40 | 3.4 |
| #8 | Red | 25° | 41 | 3.9 |
| #9 | Red | 25° | 44 | 5.2 |
| #10 | Red | 25° | 46 | 6.8 |
| #11 | Red | 25° | 48 | 8.9 |
| #12 | Red | 25° | 48 | 11.9 |
Hunter's published pressure ranges differ between the two racks: the Blue Standard chart runs from 25 to 65 PSI; the Red Standard chart runs from 30 to 60 PSI. Across the Blue range, radius gain runs about 1–2 ft per 10 PSI step until the stream loses pattern past 65 PSI; below 30 PSI the rotor still throws but loses radius (Blue #4.0 reaches 37 ft at 25 PSI vs 40 ft at 45 PSI). For supply pressures above 65 PSI Hunter offers the PGP-PR pressure-regulated 4-inch body (see HUN-58-1582), which regulates the head to a fixed pressure regardless of incoming supply.
How to read the chart
The PGP is engineered for matched precipitation across nozzles when arc is held constant. Per Hunter's data, Blue Standard precipitation rates run from 0.30 in/hr (#1.5) to 0.80 in/hr (#8.0) at 45 PSI — meaning a 180° corner head with a #3.0 nozzle and a 180° edge head with a #4.0 nozzle deliver close to the same depth of water per hour to their respective footprints. Mix nozzle sizes within a zone freely as long as arc is consistent; halve the published precipitation values for 360° heads (Hunter calculates them for 180° operation). Do NOT mix PGP rotors with fixed-spray nozzles in the same zone. Fixed sprays have a substantially higher precipitation rate than a PGP rotor, so a mixed zone will dry-spot under the rotors before the sprays finish.
Gray Low-Angle rack (12° trajectory)
The third PGP nozzle family is the Gray Low-Angle rack: seven nozzles with a 12° trajectory instead of the standard 25°. Low-angle streams resist wind better and clear low overhead obstructions (fences, hedges, parked vehicles) at the cost of some radius. The Gray rack is the right pick for coastal and other persistently-windy installs, and for any zone where the standard 25° trajectory would overspray a fence line. The per-nozzle Gray Low-Angle radius and flow values are NOT in the LIT-408 publication this article cites; Hunter publishes them on a separate "PGP Gray Low-Angle Nozzle Performance Data" sheet. Consult that sheet directly for radius and flow per gray nozzle size. The rack ships pre-installed on PGP-ADJ-LA factory variants and is also sold as a standalone retrofit pack.
Stock the PGP Low-Angle Nozzle Set (HUN-581-1015) as a retrofit alongside the rotor body when a coastal job is on the schedule.
How to swap a PGP nozzle (3 steps)
Tool required: the Hunter adjustment key (the small flat-blade tool that ships with every PGP rotor; replacements are stocked on the Hunter Rotors category page). Don't lose it; the same key sets the arc.
- Back out the nozzle retention screw. The screw sits on top of the nozzle turret, directly above the orifice. Turn it counter-clockwise with the flat blade until it stops; this releases the nozzle and also opens the break-up screen used for close-in coverage.
- Pull up the riser and pop the old nozzle out. Pull the spring-loaded riser up by hand and hold it. Pinch the nozzle by its plastic tabs and pull it straight out of the socket. Needle-nose pliers help on old, scaled heads.
- Press the new nozzle in and re-seat the screw. Press the new nozzle into the socket with its identifying number facing up. Turn the retention screw clockwise until it's snug against the nozzle face — finger-tight, not torque-tight. Release the riser; the spring pulls it back down. Run the zone to confirm pattern and flow.
Featured PGP rotors
| Rotor | Pop-up height | Best for | SKU | |
|---|---|---|---|---|
 |
PGP Ultra 4" | 4" | Current-production PGP; new installs and rotor-by-rotor retrofits | HUN-58-1350 |
 |
PGP Ultra 12" shrub | 12" | Beds, ground cover, and shrub borders where a 4" pop-up loses pattern | HUN-58-0031 |
 |
PGP-PR 4" pressure-regulated | 4" | Installs where supply pressure exceeds 60 PSI; protects nozzle pattern from over-pressure | HUN-58-1582 |
 |
PGP-ADJ 4" (original) | 4" | Like-for-like replacement on a legacy PGP install; same nozzle interface as the Ultra | HUN-58-0032 |
 |
PGP Blue Standard nozzle rack | — | Replacement rack for the Blue Standard family; eight nozzles per rack | HUN-581-1080 |
 |
PGP Gray Low-Angle nozzle rack | — | 12° trajectory; coastal/windy installs and zones with low overhead clearance | HUN-581-1015 |
Keep going
The full Hunter PGP and PGP Ultra lineup is on the Hunter Rotors category page; the broader rotor category covering every brand is at Rotors. For the K-Rain RPS75, a direct retrofit alternative to the PGP can, see the K-Rain RPS 75 Nozzle Chart. Sibling charts on the build list: Hunter I-25 Nozzle Chart and the PGJ vs PGP comparison.
