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This is my 51mm Donaldson fuel proof intake hose on my Jabiru 3300. I had to make a new FG outlet tube from the airbox because the original faced forward way to much. Like many others, I have installed a vertical alloy vane inside the tube that stops short of the carby. The hose clamp in the middle is simply just to add a little pressure to the vane to keep it from moving around.