URO 1638690508 Washer Fluid Reservoir Cap

Washer Fluid Reservoir Cap for Mercedes-Benz

This URO washer fluid reservoir cap is a direct-fit replacement for select Mercedes-Benz ML-Class SUVs. It is precision-molded to OE cap dimensions for proper reservoir compatibility and uses seal materials suited to the engine compartment environment.

• Direct-fit washer fluid reservoir cap for OE-style replacement
• Precision-molded to original cap dimensions
• Built with cap and seal materials that resist engine bay heat and exposure
• Factory pressure-tested for fit and sealing performance
• URO part number 1638690508

Fitment Details

• Fits 2003-2005 Mercedes-Benz ML350, N/A
• Fits 2002-2005 Mercedes-Benz ML500, N/A
• Fits 1998-2003 Mercedes-Benz ML320, N/A
• Fits 2000-2003 Mercedes-Benz ML55 AMG, N/A
• Fits 1999-2001 Mercedes-Benz ML430, N/A

Product Overview

Use this washer fluid reservoir cap to restore a secure seal on the windshield washer tank. The cap is made to match OE dimensions, which helps it seat correctly on original and aftermarket washer reservoirs for Mercedes-Benz ML320, ML430, ML500, ML55 AMG, and ML350 applications. Cross-reference part number 1638690508 is also listed under Genuine for the same application.

Common Issues It Can Address

• Missing or damaged washer reservoir cap
• Washer fluid evaporation from an unsecured tank opening
• Contamination entering the washer fluid reservoir
• Poor sealing at the reservoir neck
• Fitment problems with worn or incorrect replacement caps

Installation Notes

Inspect the reservoir neck and sealing surface before installation. Clean away dirt, old fluid residue, or cracks that could affect the seal. Confirm the cap seats fully and closes securely on the washer reservoir before refilling the system.

Quality Assurance

URO manufactures this cap with materials selected for underhood conditions and factory pressure-testing. It is backed by a 24 Month Unlimited Mileage Warranty.