Graco's SaniForce 1590 air-operated double diaphragm sanitary pumps have one of the best, most durable, lube-free air valves in the industry. Ideal for applications requiring high flow rates and portability, Graco's dependable diaphragm pumps offer a wide range of food-grade elastomers including Santoprene, PTFE and overmolded EPDM/PTFE.