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Nearly all plastic popup heads are made from ABS plastic, which, by its full name, works out to something like a blend of model airplane plastic and rubber. Toro used a brand name ABS called Cycolac, and could advertise their heads as being made from the exact same plastic that made football helmets.
So you're saying that the 570 is just as good as the Pro-Spray and the 1800 series?
The plastics are not the same. Rainbird is much softer plastic than Toro. You know it for a fact. Hunter's not the same either. Plus the material in the 570 is much thinner. The caps crack at a much higher rate. The threads break off as well.