Versamatic’s 1" (25mm) bolted metal air-operated double-diaphragm (AODD) pump utilizes a patented air valve system for non-stalling, lube-free operation, achieving flow rates of 0-49 gpm (0-185 lpm). These pumps provide several advantages that make them ideal for various applications. As one of Versamatic's top-selling air-operated pumps, this chemical-resistant diaphragm pump features an excellent positive seal, ensuring safe and reliable fluid transfer.