Genuine 0009974020 Washer Fluid Reservoir Plug

Mercedes-Benz Washer Fluid Reservoir Plug

This Genuine washer fluid reservoir plug is a direct-fit hardware component for select Mercedes-Benz models. It is used at the windshield washer reservoir or filler cap on many applications, including classic E-Class and S-Class vehicles.

• Genuine replacement part for washer reservoir and filler-cap applications
• Fits select Mercedes-Benz E300, E320, E420, and E500 models
• Also used on 300E, 300CE, 300TE, 300SD, 380SL, 560SEL, and related chassis
• Part number 0009974020 for ordering and fitment verification
• Direct OE-style hardware for washer system service

Detailed Fitment and Use

Part number 0009974020 is a Genuine washer fluid reservoir plug used across a wide range of Mercedes-Benz vehicles from 1965 through 1995. It appears in multiple locations depending on the chassis, including the windshield washer reservoir and the filler cap area. Common search terms for this part include Mercedes-Benz washer fluid reservoir plug, Mercedes-Benz windshield washer reservoir plug, and Mercedes-Benz 0009974020 replacement.

Compatible With Mercedes-Benz applications such as 1995 E300, 1994-1995 E320, 1994-1995 E420, 1994 E500, 1986-1993 300E, 1988-1993 300TE, 1981-1985 380SL, and 1986-1989 560SL. The part number 0009974020 is also associated with select 300SE, 300SEL, 420SEL, 560SEC, and 190E washer reservoir service points.

Common Issues This Part Addresses

• Missing or damaged washer reservoir plug
• Washer fluid leakage at the reservoir or filler cap
• Loose or deteriorated reservoir sealing point
• Service replacement for worn OE plastic hardware
• Restoration of washer system closure on older Mercedes-Benz models

Installation Notes and Quality

Verify the reservoir location and chassis application before ordering, since this plug is used in different positions across Mercedes-Benz models. Match the part number 0009974020 to the original component for the most accurate fit. Genuine OE replacement hardware supports proper service on Mercedes-Benz E-Class, S-Class, and related classic models.