This is a "wobble" sprinkler with 1/2" bsp thread to suit many commercial risers and bases. Add an o-ring to the groove above the thread for a water tight seal.
The top oscillates in a wobble motion to distribute the water in all directions.
Just turn on the tap, give it a light tap or shake the hose to start it oscillating. Once it starts oscillating it never stops until you turn the tap off.
ABS works well.
The nozzle may be a bit hard to start the thread the first time but once screwed home, it self cleans the thread and is easy from then on.