41100-ZVL-800ZB Gear NHB14M Case - Overview. The 41100-ZVL-800ZB Gear NHB14M Case is a vital component in the Honda marine engine systems. Designed to support the gear system within the lower unit (UL) of counter-rotating engines, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Gear Case assembly with NHB14M gear designation, specifically engineered for Honda marine applications.. Supports counter-rotation (UL) syste