Stainless Steel 304 Magnetic Drive Pump with 22m High Head Not every acid duty needs high flow. Dosing skids, small circulation loops and laboratory benches need pressure in a compact body, which is exactly where this MPH-15 sits. At 2900 RPM the stainless steel 304 impeller and volute deliver 18-22 m of head from only 80-120 L/min, enough to push liquid through a plate heat exchanger, a filter cartridge or a long run of small bore pipe. The sealless magnetic coupling keeps