The Allied Gomco 01-90-2725 is a critical internal service kit designed for the thermotic pump assembly in Gomco 6000 and 6010 series gastric drainage units. This manifold assembly manages the direction of airflow, housing the essential valves that allow the pump to create intermittent negative pressure. Replacing a worn manifold kit is necessary when the unit fails to hold vacuum or if the intermittent timing cycles become inconsistent, ensuring the device meets clinical standards for low-vacuum drainage.