40202-ZY3-621ZD Separator *NH565* - Overview. The 40202-ZY3-621ZD Separator *NH565* is a crucial component in the Honda marine engine fuel system, designed specifically to separate fuel from water and contaminants, thus ensuring clean fuel delivery. As part of the fuel system, this separator plays a vital role in maintaining the reliability and efficiency of your Honda marine engine. Engineered for marine use, it helps protect sensitive engine components from damage caused by impurities.. Key Fe