87512-ZV4-A21 Mark (6A) - Overview. The 87512-ZV4-A21 Mark (6A) is a genuine Honda marine rigging component designed specifically for Honda marine engine systems. This marking receptacle plays a pivotal role in the rigging system, supporting electrical and control functions essential for marine engine operation. Its precise manufacturing to Honda's factory specifications ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. OEM Honda Mar