If you're wanting to hard plumb the lines (which looks the best IMO
), I'd do a 3/4" thread to slip adaptor coming off the pump to your PVC
to a true union gate valve. (I'm pretty sure that the return for a Mag 7 is 3/4" male thread. Run your PVC
to your return point however you need to, and then to a 3/4" PVC
to 3/4" locline adaptor which will then go to your wye, to the loclines to the nozzles. (One piece of advice, use unions to simplify breaking things down in case of move, redesign or whatever.) Smaller diameter does NOT equal more powerful water movement at the end of the run, so use the biggest diameter you can for your pump.
I bought my locline components from savko.com. They had the best pricing I could find. I will say two of my four nozzles were backorders, and took about an extra month to ship, and they didn't really communicate that they were backordered, but were still being sent. I was just charged for the two I got, and there was no explanation given. The others just showed up later.