90508-ZW1-003 Tab Washer - Overview. The 90508-ZW1-003 Tab Washer is an essential component within the Honda marine engine system, specifically designed for marine applications to provide reliable securing and alignment functions. This washer plays a critical role in maintaining mechanical integrity and ensuring proper assembly of the propeller nut and related hardware, crucial for the dependable operation of Honda marine engines. Its precise fitment guarantees seamless integration with existing