A setup I've never seen before..
1/2" Drip tubing running around a shrub area with 1/4 "drip tubing Tapped off and running to this... The 1/4 Drip Tubing is SUPPLYING these 4" irritrol spray heads with extremely low flow nozzles.
For what it is it works.
One of the nozzles was clogged so I tried to put in a 8F and it wouldn't pop up. I dug it up and found this!