19313-ZX2-000ZA Spacer *NH8* - Overview. The 19313-ZX2-000ZA Spacer *NH8* is a genuine OEM Honda part designed to function as a thermostat cover spacer within Honda marine engine systems. This critical component supports the engine cooling system by providing necessary spacing to ensure proper thermostat installation, thereby aiding in efficient temperature regulation and engine reliability. Made with exact factory specifications, this spacer ensures seamless integration with existing parts, mai