The Senninger PSR-2 is a patented pressure regulator designed for surface water and pivot irrigation systems, handling flow rates from 0.5 to 15 GPM while maintaining a constant preset outlet pressure despite varying inlet pressures to ensure uniform irrigation coverage. It features a smooth, debris-resistant inlet design and is engineered to maintain performance when inlet pressure is at least 5 PSI above the outlet setting and within maximum limits. The unit is 100% pressure tested, offers low hysteresis and minimal friction loss, and includes a 2-year warranty, but it is intended for outdoor use only and is not NSF certified. It must not be used under static pressure or installed before valves or timers, as this can damage the internal spring, and proper pressure readings require system flow conditions with a gauge placed at the end of a zone once the system is running and fully pressurized.