Versamatic’s 1" (25mm) bolted plastic air-operated double-diaphragm (AODD) pump features a patented non-stalling, lubrication-free air valve system that offers excellent chemical resistance, ensuring longevity and reliability. The 1" model comes in various porting configurations for easy installation and versatile application. With a robust, leak-free design, this diaphragm pump has a flow rate of up to 43 gpm (163 lpm).