Replace an underground irrigation spray head or mount on any riser. Sized for easy conversion of a Rain Bird 1806 pop-up spray head. Also connects to other standard 1/2" irrigation fittings. All in one unit includes 30 PSI regulator, to avoid excess flow, backflow preventer to stop water from flowing back into your home's system, 200 mesh filter to trap rust and sediment, helping to keep emitters flowing trouble free, and swivel tee. Easy, leak-proof connections.