... , stable work and high precise transfer.2. Acceptable pump heads for YZ1515x, YZ2515x, SN25, DG-1, DG ... N represents the channel number. The YZ series of pump head have 1, 2, 3, 4 channels to ... 2(10) represent 2 channels and 10 rollers. Increasing one channel every time, the weight increases 0. ... .2*YZ1515x represent 2 YZ1515x pump heads connect, and form 2 channels. Increasing one channel every time, the ...