The path the beer takes in and out of the racking arm and valve is very smooth, reducing the places that dried beer and yeast can hide and contaminate your beer. It also has a positioning arm that lets you know at what angle the racking arm is inside the conical.
Stop leaving clean, perfectly good, beer in your conical fermenter and always drain from the perfect height with tri-clover style rotating racking arm. Remove your existing tri-clamp valve and place this rotating racking arm between the tank and your valve. When it is time to rack off, slightly loosen the clamp nearest the tank and use the built in handle to rotate to just about the trub level.