I also found a neat trick to hook up the chained sprinklers. I have two of them in a chain and I found that I needed to be able to separately adjust the water flow to each sprinkler. Just using the built-in flow through of the sprinklers (one input connection and one output connection) didn't work because then each sprinkler took whatever water it could, resulting in one of them spraying too far and the other not spraying far enough.
So I took one of those Y connectors with shutoffs and connected the main feed hose (the darker hose in the picture) to the input of the first sprinkler in the chain, and then connected a hose to that Y going to the second sprinkler (the lighter green hose). Now I can use the two shutoff valves in partially open positions to set the flow I need to each of the two sprinkler heads in the chain, so they are balanced to my needs. Also, since I now have control of the water flow out at the sprinkler heads themselves, I can just turn on the water at the house spigot to full volume. No more needing a second person to help me set the level - one at the main valve and one out in view of the sprinkler heads yelling "Turn it down a little, no, too much, turn it back up". You can do all that with one person now since the control is right out there where the one person can view the sprinkler heads themselves.
High end sprinkler heads may have built-in adjustments for the flow they receive, but the ones I have a cheap ones and don't have this fine tuning control.
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