Oh, there's a hole at the top of the line that leads to an underground lane? That makes sense, I couldn't make that out in the photo, thanks.
If you drain to the far left, and kickback is lit, the ball gets sent along the line and comes out the top (and IIRC, refills your fuel?)
If you drain to the far left, and kickback is lit, the ball gets sent along the line and comes out the top (and IIRC, refills your fuel?)