Geyser jet nozzles produce an output fountain jet that combines a mixture of water from an immersed pump, from the pond, and the air. The end jet pattern is a column of white water, created by mixing air and water. Because water is drawn from the fountain pond, a predetermined length of the outlet pipe must remain submerged. This level of water must be maintained to ensure the performance levels given in the chart. They are equipped with tilt correctors to prevent unwanted jet inclination. The smaller sized geyser jet nozzles (1/2" and 1") are made of 100% cast and machined brass, while the larger sizes (1½", 2, 2½" and 3").