40mm PVC waste pipe will do at a pinch, will only work with sprockets >13t, 6 bar or 10 bar rated will work, 16 bar won't because of the excessive wall thickness.
@gbj_tester started
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40mm PVC waste pipe will do at a pinch, will only work with sprockets >13t, 6 bar or 10 bar rated will work, 16 bar won't because of the excessive wall thickness.