What a PRS body does
Hunter's Pro-Spray PRS line is a pressure-regulated spray body: a pop-up with a built-in regulator that holds outlet pressure constant no matter what the supply line is doing. Without regulation, a fixed-spray nozzle at 60 PSI mists badly. A long lateral run at 25 PSI sputters short. A PRS body locks the nozzle at its design pressure so the head behaves the same in every zone, top to bottom of the slope, morning to evening as municipal pressure drifts.
Both bodies accept the same female-threaded Hunter nozzles, so they are physically interchangeable. The cap color is the visible cue and the regulator rating is the actual call. The full PRS lineup, in 4-inch, 6-inch, 12-inch, and shrub risers, with and without check valves, sits on the PRS Spray Heads category.
PRS30: when 30 PSI is the right call
Hunter's traditional fixed-arc spray nozzles (the 15-foot fan, 15-foot half, 10-foot quarter, and the Pro Adjustable nozzle) are nozzle-specified at 30 PSI at the inlet. Run them above 30 PSI and you get visible misting: water atomizes into drift instead of throwing as droplets. Misting wastes water, lands on hardscape and walls, and shortens nozzle life. Run them below 30 PSI and the throw shortens and the pattern gets streaky.
The PRS30 body holds the outlet at 30 PSI even when the supply line sits at 50, 60, or 80 PSI. For a zone of fixed-spray heads on a typical residential main, that is the canonical pairing. Pick PRS30 when:
- The zone is fixed-arc (fan, half-fan, quarter, three-quarter) or Pro Adjustable nozzles.
- You have variable static pressure across the day: well systems, hilly municipal lines, peak versus off-peak swings.
- You are retrofitting an old unregulated zone where misting is the chronic complaint.
PRS40: when 40 PSI is the right call
Hunter MP Rotator nozzles are engineered around a 40 PSI design point. At 40 PSI dynamic at the nozzle they deliver their published radius and matched-precipitation rate. Performance degrades at the edges of the 30 to 55 PSI operating range and falls off entirely outside it. PRS40 is the body Hunter built to feed MP Rotators their design pressure, and it remains the only 40 PSI regulated pop-up on the market.
Pick PRS40 when:
- The zone runs MP Rotator nozzles: MP1000, MP2000, MP3000, MP Corner, or any of the 360-degree fixed-circle variants. The full family lives on the Rotary Nozzles category.
- You want each MP Rotator delivering its rated throw. The 22 to 30 foot MP3000 in particular needs the full 40 PSI to reach the long end of its radius range.
- The static supply pressure swings above 50 PSI. Without regulation, the MP Rotator's multi-stream profile degrades and the internal mechanism wears faster.
Pairing MP Rotators with an unregulated body, or running them downstream of a PRS30 above the MP800SR's shortest setting, is the classic field error. The symptom is visible: shorter than rated throw on the long-radius MP3000s, a ragged stream profile, and accelerated wear at the rotation mechanism.
Symptoms that say you have the wrong body
Every Pro-Spray PRS body, shipped fast
Pick the 30 PSI brown-cap body for fixed sprays or the 40 PSI gray-cap body for MP Rotators, in 4-inch, 6-inch, 12-inch, and check-valve variants.
