I have just bought some from cleantec and put them in today, bit of a disapointment i must say the bore seems too large, i normally set varistream to 1.5lpm to 2lpm but with these fan jets i had to turn flow up to 3lpm to 3.5lpm just to get water to spray in a fan, but having said that when they do fan there good and seem to give a good coverage for the area of the brush
Cleantec have some finer spray nozzles there going to send me so will try then to see if there any better
I will say that if Cleantec tell you to drill 8mm hole in your brush I wouldn't I would drill 7mm they'll be a better fit
Chris