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It's part of the Crankcase Ventilation System. It's nothing more than a supply of fresh air to the inside of your engine. Be sure to put it back on when your done, dont put a breather on there unless you use some type of catch can setup.
yeah thats a hose clamp i cant tell by the pic cause its kinda blurry, there are a couple of kinds, A. flat head screw driver, B. socket, C. pinch the peiced that stick out together