I used PVC drainage type pipe that had the holes already in it, I used a drain type grate on the sealed end and a screw in cap on the end by the sewer drain. I used metal pipe strap (strap with holes about every inch) and used self taping screws/bolts into the frame on either side of the pipe and snugged it up to the frame. 4 holes into the frame (2 for each end of the pipe) and it was a snap... I'll see if I can get some photos the next time I get the rig from storage.
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