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what is the difference between the GUAL and the GUAN boxes?

The GUAL has hubs, in the shape of an "L" going into the center of one side then out  the center of the side, at a 90 degree angle.   GUAN has 2 hubs, in the shape of an "L" at 90 degree angles from each other, but placed to the outer edge of the diameter of the GUAN body. 

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