Octa-Bubbler© is a pressure compensating device with a 1/2 in FPT inlet and 8 swivel port 3/16 in outlets. Constructed using ABS plastic. Built-in back flow prevention engineered for added protection. Octa-Bubblers deliver water to multiple locations. Optional port plugs are available for unused ports. Interchangeable color coded flow control gives you the ability to change your GPH without changing the bubbler. Available flow rates are 2 GPH, 6 GPH and 10 GPH, 20 GPH using a flow control device. Pressure compensation range is 20 _ 60 psi.