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Dual Swivel Water Cross-Over Adapter, Silver AF64-2188 Product:Suit GM LS Series Engines with 2 x -4AN Male Ends Male to Male Barb PushDual Swivel Water Cross Over Adapter, SilverSuit GM LS Series Engines with 2 x 4AN Male Ends AF64 2188 64 2188 Aeroflow Performance AN steam vent adapters adapters are specifically designed for the LS series engine, these cross over adapters compliment aftermarket intakes and accessories that the factory rigid brazed hard lines will not. The lines are designed to eliminate trapped air and steam from your engine to prevent hot spots and overheating.