The Allied Gomco 01-90-2525 is the essential internal component for maintaining the vacuum integrity of your diaphragm suction pump. This reinforced rubber diaphragm is responsible for creating the reciprocating motion that generates negative pressure. Over time, diaphragms can lose flexibility or develop micro-tears, leading to reduced suction power. This OEM part is specifically designed to restore factory-spec vacuum performance for Gomco’s popular 300 series and mobile general-use aspirators.