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Not necessarily. We made a skate rail out of plumbing pipe, it was galvanized steel I believe, but, you buy a pipe with a threaded end, and then a 90 degree fitting angled towards the ground attach another pipe to get your desired height, then thread on a T and have pipes going off of each end of the T for the base. The rail we had went to the ground, but you could figure out a way to prop up the other end with some creative solution, IE, predrill a hole an bolt something on the underside and go from there.
Junkyard !! Make sure not to get Galvanize, fumes can kill you are make you really sick.. Look for some with a little rust on them, there more then Lilkly to be steel and not have a GalvanizeÂ coating. Just pick out the stright ones and make sure there's no dimples or dents, for a straight slide. Make friends with a welder or find a friends dad that's a welder.