Hi Frank, if you're talking about a Hunter rotor like the PGP it has a 3/4 inch port.
Some of Hunter sprinklers are 1/2". It depends on which one you're talking about.
I have Toro now having trouble with the rotors not working so was thing about changing them to a different brand. What do you think should I stay with Toro or start to switch to Hunter/
thanks guy for your fast replys.
Frank Disabled Vietnam Vet 68-69 US ARMY Brothers Forever.. Retired Carpenter Local 272
Chicago