All vent and drain lines, and their fittings, that are located in a designated fire zone must, if they carry flammable fluids or gases, comply with § 125.157, if the Administrator finds that the rupture or breakage of any vent or drain line may result in a fire hazard.
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14 CFR · PART 125
§ 125.159 Vent and drain lines.
Official text · Current as of Oct 19, 2026 · from eCFR
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