it's most likely for the oil drain plug
exhaust flow
Water Resistant: Provides a good seal against water
a comprehensive 33-piece set designed for precision and versatility
Stunning Aesthetics: Sleek 50mm central pipes add a touch of elegance
Mercedes-Benz Check Valve for Brake Booster Line | 1960-2025 0004313507 91160610510 it's most likely for theCheck Valve for Brake Booster Line for 280SE (1968 1980), 300CE (1993), 300D (1991), 300E (1992), 300SE (1992), 300SL (1991), 300TD (1980), 420SEL (1991), 450SEL (1977), 450SL (1979), 450SLC (1976 1980), 500E (1992), 500SL (1992), 560SEL (1991), C320 (2002), CLK320 (1999 2002), CLK430 (2000 2003), E320 (1997 2002), ML320 (1999), ML55 AMG (2002), S350 (1995), S600 (1996), SL320 (1995), SLK230 (2001), SLK320 (2003), 190DC (1964), 200 (1967), 200D