Durable C-shaped plastic stand supports any Ocean Currents Wave Maker at 3-1/2" height from the base. 2-1/2" wide x 3" tall round-nosed tab also supports most small (1/2" outlet) powerheads.
The ring controls shape and size of the fan-shaped flat stream outlet on the Pulser and the Rotating/Pulser. Three selectable options:
4 discreet holes in a fan shape
A narrow slot
A wide slot