Abstract: An endplate assembly is connected to a fuel cell stack. An endplate assembly has an external surface and an internal surface. The internal surface faces toward the fuel cell stack and the external surface is opposite the internal surface and faces away from the fuel cell stack. The endplate assembly includes at least one internal fluid flow passage located between the internal surface and the external surface. The at least one internal fluid flow passage is configured to direct fluid in a direction transverse to the direction faced by the internal surface and the direction faced by the external surface. Also, an interior portion may be located between the internal surface and the external surface. A port may provide fluid communication between an external component connected to the external surface and the interior portion. In addition, a component that processes, senses or measures a fluid may be integrated with said endplate assembly.