The OASE Vulkan 37 - 2.5 K fountain nozzle creates a dramatic, eye-catching vertical spray that enhances water displays, creating a high impact visual effect.The water spray is 6.58 feet high and 4.25 feet in diameter when powered by the Neptun 1600 fountain pump. Visual impact can be enhanced by utilizing the Neptun 2600 fountain pump to create a spray of water 12.7 feet high and 7.58 feet in diameter.