Gilmour's innovative shape control means customizing your sprinkler's coverage area has never been simpler. The collars easily slide to mirror the desired coverage area. To set your area for 360-degree coverage, just pull up on the top. To adjust your spray distance. We've reimagined the design of the traditional sprinkler and simplified it. Now, setting the radius, distance and flow is simple and stress free. just move the adjustment arm forward or back.