Drip Depot Adjustable Mini Bubbler - 1/4" BarbAdjustable mini bubblers are designed to produce a gentle umbrella pattern for rapid watering near the root zone. Flow rates are adjustable by turning the cap (0-14 clicks) to produce 0 to 31 GPH with a radius of 0" to 9" at 30 PSI. Each Mini Bubbler has an adjustable cap that allows for simultaneous control of the flow rate and the wetting area, and can be shut off completely if desired. These mini bubblers use a 1/4" barb to connect to 1/4" micro tubing, rigid risers, or directly into mainline tubing. Features:Rotation of the cap allows adjustment of flow and coverage down to a complete shut-offHigh volume direct watering of plantsDrippers can be placed using 1/4" micro tubing or connected directly into mainline tubingRemovable cap for easy cleaningConstructed of UV-resistant, durable plastic materialClicks15 PSI20 PSI30 PSIGPHRadiusGPHRadiusGPHRadius24.0 0"5.00"7.00"47.00"9.00"11.00"610.00"13.00"15.00"813.00"17.02"19.03"1016.02"20.03"23.04.5"1219.03"23.04.5"27.07.5"1422.04.5"27.06.5"31.09" Please Note: Adjustable drippers use a lot of water. It is very easy to overtax a drip system when using many adjustable drippers that are operating fully open.