... speed, stable work and high precise transfer.2. Acceptable pump heads for YZ1515x, YZ2515x, SN25, DG-1, DG-2, DG-4 ... .5. High torque and low power loss, connect many pump heads in series or install multichannel pump head for satisfying the ... weight increases 0.05kg.2*YZ1515x represent 2 YZ1515x pump heads connect, and form 2 channels. Increasing one channel every time ...