NAVA New 1/2&rdquo; DN15 Interior 3/4&rdquo; DN20 Exterior Thread Mushroom Fountain Nozzle Spray Head Pond Bell or so called Mushroom nozzle creates a clear water bell pattern in the adjustable shape. It is the least noise and splash fountain effect. The relaxing sound of splashing water is particularly effective in silence wind-free locations like the water garden, indoor reception hall, or outdoor pool that are protected from the wind. Bell nozzles are water level independent and can be located in dry areas. Material: Brass; Inlet: 1/2" DN15 Female Thread 3/4" DN20 Male Thread; Working Pressure: 0.7-1.2 psi; Water Flow: 6.6 gpm; Jet Spray Height: 1 foot 100% MONEY BACK GUARANTEE- NAVAdeal are backed by 100% guarantee that you are fully satisfied with your product or receive your money back.