Octa-Bubbler? is a pressure compensating device with a 1/2 inch FPT inlet and 8 swivel port 3/16 inch 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. Each Octa-Bubbler? has a 150 mesh filter screen for clog resistance. 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.