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!