17" Spray Ring Kit attaches directly to water garden pump. The intake is 1/2" FNPT. The spray ring is recommended for use with pumps from 400 gph to 1500 gph. Optional Fountain heads can be attached to the center discharge to create stunning fountain effects. The FT25 riser tube will attach to the center of the ring to enable you to attach any Cal Pump fountain head. The spray ring comes with 21 adjustable jet nozzles to direct the spray pattern outward, inward or in a spiral pattern.