Full Circle Adjustable Sprayer has 8 streams (Bag of 10) of water allowing for the option of changing the flow rate to each individual plant, from a low drip, to a gentle stream, with a diameter of about 3'. Twisting the dial on the dripper towards the "+" or the " -" signs will allow you to adjust the flow between 0 gph and 10 gph. Best used at 25 psi. Excellent for shrub plantings, ground covers, flowers beds, trees, and containers. Adjustable dripper on a stake has a barb to attach 1/4" tubing to that you have coming off of your mainline.