Hunter PGP-ADJ 4" Pop-Up Rotor

PGP-ADJ 4" – 3/4" Inlet Specifications

What is the difference between the PGP-ADJ and the PGP Ultra?
The PGP-ADJ is Hunter's original, field-proven residential rotor — reliable, affordable, and simple to install. The PGP Ultra is an upgraded version that adds a non-strippable drive (turret can be manually rotated without damage), automatic arc return (turret always returns to its programmed arc), a headed and slotted set screw, and 34 total nozzle options. For most standard residential zones, the PGP-ADJ is an excellent value. If you need those added features — especially for high-traffic or commercial installations — the PGP Ultra is the better investment.

What is the difference between the PGP-ADJ and the PGJ?
The PGP-ADJ uses a 3/4" inlet and is designed for larger residential zones, with a radius of 22'–52' and an operating pressure of 25–65 PSI. The Hunter PGJ uses a 1/2" inlet and is suited for smaller zones with a shorter radius (15'–34') and an operating pressure of 60–100 PSI. The PGJ is ideal when you want the efficiency of a gear-drive rotor in a compact, spray-sized package — and it can even be paired in the same zone as larger rotors thanks to its matched precipitation rate design.

Which nozzle color should I choose — red or blue?
Both standard red and standard blue nozzle trees cover a radius range of roughly 22'–52' depending on pressure. The key difference is flow: blue nozzles run at somewhat higher flows and are typically used for longer spacings and higher-volume zones. Red nozzles provide a broader range of output options, including smaller low-flow nozzles for tighter spacings. Check Hunter's nozzle performance data (available in the Downloads section) to match the nozzle number to your desired radius and system flow.

Are low-angle nozzles available for the PGP-ADJ?
Yes. Gray low-angle nozzles are available separately and fit the same body. Low-angle nozzles reduce the trajectory of the water stream, making them ideal for windy sites, areas under tree canopies, or applications where a lower arc helps with uniformity. Keep in mind that low-angle nozzles have a shorter radius than their standard counterparts, so adjust your head spacing accordingly.

What pressure range does the PGP-ADJ require?
The rotor is designed to operate between 25 and 65 PSI. For best performance and most uniform precipitation, operate within this range. If your supply pressure is higher than 65 PSI, we recommend installing a pressure regulator upstream to protect the rotor and maintain consistent coverage.

Can I mix PGP-ADJ rotors and PGJ rotors on the same zone?
In general, it is not recommended to mix rotors and spray heads on the same zone due to differences in precipitation rate and cycle time. However, the PGP-ADJ and PGJ can sometimes be matched in the same zone if you carefully select nozzles that produce similar precipitation rates. Consult Hunter's nozzle performance charts to verify compatibility before designing mixed zones.

Is there a version with a built-in check valve?
The standard PGP-ADJ does not include a check valve. If low-head drainage is a concern — where water drains out of the lowest rotors after the valve closes — consider the PGP Ultra, which is available in a check valve version, or the Hunter I-20 Rotor with check valve for premium commercial applications.

Is this compatible with smart irrigation controllers?
Yes. The PGP-ADJ is a standard 3/4" gear-drive rotor and is compatible with any irrigation controller that operates solenoid valves, including smart controllers from Hunter, Rachio, Orbit B-Hyve, and others. DripWorks carries a full range of compatible timers and controllers.