49 CFR Part 192 · Subpart F§ 192.277 Ductile iron pipe.Snapshot 2026-07-23 · View source on eCFR (a) Ductile iron pipe may not be joined by threaded joints. (b) Ductile iron pipe may not be joined by brazing. [!quote] Source citation [35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-62, 54 FR 5628, Feb. 6, 1989]