no reason except they are grey in color rather than white IMO . you will never exceed the capabilities of schedule 40 so i am just guessing on its purely aesthetics .
Besides the look the only other reason I could think to use it is the fact that normal pvc sch 40 isnt uv rated. I wonder if it may be more prone to failure if used under some aquarium lighting. When I was in irrigation we saw tons of pvc break just from sitting in the sun.
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