I just looked at mine, i couldn't quite get a picture of it, but down by the frame by the left rear tire there is a hole in the skid plate, thats the lower frame tube in that diagram, and there is a rubber grommet installed into that hole of the metal skid plate for the tube to sit in. The rubber grommet is missing on mine, never noticed it before, the tube is just sitting in the hole. I could easily go get a grommet from my assortment box and put it in that hole and put the tube back in though, not a big deal. Its just there to keep the tube pointed down and below the frame so any spillover from the battery won't drip onto everything.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....