Abstract: An adjustable sprinkler including an inner housing slideably engaged with an outer housing. The inner housing includes a head rotatably mounted to a body. The outer housing includes an inlet which receives pressurized water and transfers the pressurized water to a nozzle attached to the head. The inner housing includes a reverser for selectively driving an impeller in two different directions. The impeller is connected to a reducer which reduces the rotational rate transferred from the impeller to the head and also enables the head to be manually rotated without causing damage to the internal components of the adjustable sprinkler. The head includes a click set and a cap. The cap defines at least one opening to enable a user to insert a tool through the cap to adjust and set the boundaries of the spray pattern using the click set.