screw the swing joints for a lawn system. Get some funny pipe http://www.toro.com/sprinklers/pipes/pipe/53186.html that's all we use up here in the North East, and it's so much easier and faster. Swing joints are for Golf Courses. If you don't know what they have for water get yourself a 5 gallon bucket and go to an outside faucet and time how long it takes to fill the bucket. That will give you an idea on what they have GPM. If you have 10 gallon's a min. then you can get 5 to 6 heads on a zones ,depending on what nozzle you use. As someone else said spray heads put out tons of water and there is no way your going to get that many spray on one zone. PM me if you have any questions as I've been doing this kind of work for 19 years, Golf and Residential.