This heavy-duty oil filler cap is specifically designed for Doosan construction equipment, including DL200, DL420, DX140, DX160, and DX190 models. The cap features a robust, octagonal design with deep grooves for superior grip during removal and installation. Made from durable black polymer material, this replacement part (65.01810-5011, 65.01810-5007) ensures a secure seal to protect your engine's oil system from contamination and leakage. The cap includes clear 'OIL' marking and an equipment symbol molded into its surface for easy identification. Its engineered construction provides reliable performance in demanding construction environments while maintaining proper oil system pressure. This direct-fit component matches original specifications for seamless compatibility with your Doosan equipment.