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It does not seem to regulate the water flow at all. I thought the first one is broken, so I used the 2nd one and see the same result, the water just simply "shoot" out of the pipe. It might be designed for a different purpose, but it is definitely not "dripping".
Prime in this case will get you free shipping and swiftly, but Lord help you if you want to return the product....$5.99 return package fee...Amazon that's a bit steep considering 2 postage stamps would cover the return fair. This product did provide great coverage for my Florida garden.
I bought this thinking that the emitter would have a small stream of water coming out as it is 5GPH instead it shoots straight up several feet into the air. King of like when your garden hose is set to jet. Can not use these for my drip lines.