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570 MPR Spray heads
Can you replace one(1) standard Toro spray head on a zone with a Toro 570MPR head or do all the spray heads on that zone have to be replaced with the MPR heads?
Do you mean their MPR nozzles (matched precipitation rate) or do you mean MP Rotator (not Toro) rotary nozzles?
The matched precipitation rate spry nozzles.
You can mix and match those nozzles. The MPR won't put out more water at higher pressures, like the non-MPR nozzles will.