GM Genuine Parts Engine Coolant Filler Necks are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These necks often provide an interface for the radiator cap, and provides an access point to add coolant into your vehicle's cooling system. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

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• Provides an access point to add coolant into your vehicle's cooling system
• Precise fit for ease of installation
• Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
• GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors.
• GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
• GM regularly updates production and service part designs to integrate new materials and technologies
• Collision parts are designed to help promote proper and safe repair