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Moroso Chevrolet water outlet filler neck with a 20AN connection and O‑ring seal is sized for big‑block and small‑block installations. The aluminum outlet neck adapts the water outlet to larger AN plumbing for high‑flow or custom cooling systems while retaining an O‑ring seal for leak resistance. It provides a clean, serviceable connection point for Chevrolet engine coolant plumbing.
Moroso Chevrolet Big Block/Small Block Water Outlet Filler Neck -20An w/O-Ring - Aluminum
