Toro's TMPR25 Set Toro Tr Series 25-Ft. Mpr Nozzle nozzles are a distinct nozzle series that take the guesswork out of watering performance. Matched Precipitation Rate (MPR) means every arc in a family of similar radius will apply water at the same rate regardless of the pattern. By delivering exacting radius and the precise amount of water required you are guaranteed consistent coverage within different landscape areas. MPR technology prevents run-off, erosion and over-watering further ensuring the nozzle performance you are expecting. It's better water management in every nozzle.