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The Fragola 4AN tube nut is a single replacement nut for AN‑style tubing connections used on engine and fluid systems. Supplied as an individual hardware piece, it secures fittings on -4AN lines where a dedicated nut is required for hose or tube assemblies. Keep a spare on hand for repairs or custom plumbing work to maintain leak‑free connections in fuel, oil or coolant lines.
Fragola -4AN Tube Nut
