Hunter I-60-36S Full-Circle Rotor - Low Pressure.Patented Precision Distribution Control assures even coverage at low pressures without the need for a booster pump; 6 color-coded nozzles for truly uniform coverage and fast identification; Stainless-steel riser for increased durability in harsh soil conditions; Easy arc adjustment (40-360) - up, down, wet or dry with through-the-top convenience. Heavy-duty, water-lubricated gear drive; Patented VStat self-adjusting stator- no stator rings required, drives with more power and adds years to sprinkler life; Drain check valve for up to 10 feet elevation change.