36145-PM4-004 Check Valve - Overview. The 36145-PM4-004 Check Valve is a critical component within Honda marine engine systems, primarily supporting the fuel and vacuum systems by allowing fluid or air to flow in one direction only, thus preventing backflow. This check valve ensures the proper pressure regulation and operational reliability of your marine engine system, maintaining smooth performance and preventing potential damage or failure.. Key Features. Genuine OEM Honda Check Valve designe