Model description of peristaltic pump For example, BS100-1A+YZ15A means BS100-1A driver and YZ15A pump head. Driver model description For example: BS100-1A means stepper motor drive, speed drive, maximum speed is 100RPM, first edition, drive housing is made of plastic material. Model description of pump head For example: YZ15A represents the easy mounting pump head, suitable for mounting 1.6mm wall thickness hose, and the pump head material is polysulfone (PSF).