Hi buddy!
The end of the pipe has a steel or iron reducer welded in. I think it's steel., anyhoo, it's a 1/4 NPT pipe thread that fits a bunch of fittings quickly. I plan on plugging it up for openers..the pipe brace bolts onto the frame. U can kinda see where I welded to the wheel hub. I bolted it thru the puch wheel, thru the urban hub using the puch hardware then capped it off with the circle plates. The wheel bolt pattern was drilled thru the cover plate then plug welded thru to the nut. It's on there! Better than it was stock and straight as can be both ways. Do some uP!!