Product: Windshield Washer Reservoir Tank Bottle Cap Cover Fits: Cadillac CTS, SRX, ATS — model years 2013 through 2021 Part numbers: 12767700, 12788573 Why this cap matters Stops leaks and overflow: Restores a tight seal on the windshield washer fluid reservoir so fluid stays where it belongs and your engine bay stays dry. Durable replacement: Made from quality plastic designed to resist heat, cracking, and fatigue that commonly damage OEM caps. Directfit solution: Engineered to match the original reservoir opening for Cadillac CTS, SRX, and ATS (2013–2021) — installs quickly with no modification. Key features Compatibility: Specifically for Cadillac CTS, SRX, ATS model years 2013–2021. Replaces caps with part numbers 12767700 and 12788573. Material: quality, automotivegrade plastic for reliable sealing and long service life. Function: Seals windshield washer fluid reservoir to prevent leaks, evaporation, and contamination. Seal design: Includes gasket seating area—ensure gasket is correctly positioned for a proper seal and leak performance. Ease of installation: Simple removeand procedure; no tools required in most cases. How it helps you Prevents messy enginebay leaks that can damage nearby components or create corrosion. Keeps washer fluid available when you need it—important for safe visibility in rain, snow, and road spray. Affordable, quick fix compared to replacing the entire reservoir. Installation tips Remove the damaged or brittle cap by hand. Inspect the reservoir neck and gasket for debris; clean if . Press the replacement cap down evenly until it seats. Verify the gasket is seated and the cap is snug. Check for leaks after filling the reservoir. Practical use scenarios 1) Postheat damage: a warped or cracked cap that started leaking after prolonged enginebay heat exposure to stop fluid loss and prevent puddles. 2) Winter maintenance: Install before cold weather to ensure the reservoir remains sealed when using washer fluid additives and to reduce evaporation or contamination. 3) Used car prep: a missing or brittle cap when buying or preparing a used Cadillac CTS, SRX, or ATS to restore proper function and peace of mind. Exact fit and function for Cadillac owners who need a reliable, easytoinstall replacement for part numbers 12767700 and 12788573.