Hunter PGP04CVPRB 4" PGP Ultra Roto Adjustable from 50°to 360° ¾" Inlet Check Valve Pressure-Regulated Eight Standard and Four Low-Angle Nozzles Included. The PGP and I-20 pressure regulated bodies will take incoming pressures of 50-100 PSI and reduce them to 45 PSI. The Hunter PRB Rotors allow the nozzles to operate at peak efficiency, saving up to 25% more water. Having the pressure regulator in the body allows it to remain in place and function even if the original riser is removed and replaced for service.