Peristaltic pump pump head circulating high flow corrosion-resistant laboratory online analyser YZ1515 YZ2515 pump head Product Name YZ1515X/YZ2515X Pump head material ABS Rotor material 304 stainless steel Number of rollers 3 rotors/6 rotors Speed range 5~400rpm Weight 373g/433g Applicable pump tube 14#, 16#, 25#, 17#, 18#, 15#, 24#.