Windshield Washer Lid — Compatible with Buick — 1PC — OEM: 88958101 Direct replacement cap for windshield washer fluid reservoir; exterior black plastic cover supplied as a single piece (1PC). OEM reference 88958101 ensures the cap matches original specifications for fit and function where this number is required. Key benefits Prevents leaks: provides a secure seal to stop washer fluid from spilling or evaporating. Maintains washer system reliability: keeps contaminants out of the reservoir and helps ensure consistent fluid delivery to the windshield. Durable construction: made from resilient black plastic designed to withstand exposure to washer fluid and exterior temperatures. Compatibility and fit Tailored for Buick applications and compatible with many vehicle models that use the same reservoir cap dimensions. Marketed as a universalstyle replacement to fit most standard washer fluid reservoir openings; designed to worn, cracked, or missing caps. Performance and materials Plastic construction resists common automotive chemicals and outdoor conditions. Simple snapon/pressfit design for easy installation and removal during routine maintenance. Practical uses a cracked or missing cap to stop washer fluid loss and prevent debris contamination. Keep as a spare in a maintenance kit for long trips or seasonal checks. Install during routine reservoir cleaning or fluid replacement to restore a proper seal. What you get One (1) black exterior windshield washer reservoir cap compatible with Buick, OEM: 88958101. Notes Verify OEM number or reservoir opening before to confirm fit for your vehicle. Intended as a direct replacement cap; does not include reservoir bottle or other components.