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You could go out and buy some mandrel bends, which can run you $30 plus apiece, or you could do like we did and use the cheapest source of bends on the planet: a set of old, discarded headers. We unearthed a pair that look like they'd been dredged up from the bottom of a peat bog. We passed them through our chop saw a couple more times separating the collector and flange and again cutting the bends from the sections of straight pipe. View Related Article
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