I have 2 250's and 1 600. I guess I would have to get the Irritrol 700 1" to match up with what I have. But I really think that I have the 3/4" from looking at online pics. the Irritrol 3/4" does 750 in about 10min. The Irritrol 1" with a rule 3800 does 750 in about 8min. So I would think the Irritrol 1" with a rule 2000 should do 750 in about 9 min.