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The Nitrous Express 4AN blue B-nut (qty 1) is a single replacement B-nut sized for 4AN fittings and finished in blue for color-coding or visual matching. It fastens AN swivel connections and is intended for use during assembly, maintenance, or repair of AN-style fuel or nitrous lines. Use as a direct replacement when a 4AN B-nut is needed.
Nitrous Express 4AN Blue B-Nut (Qty 1)
