... of pump head have 1, 2, 3, 4 channels to choose. The DG series of multichannel pump ... head can choose 1,2,4,6,8,12 channels. In the DG series types, the numerical ... represent roller number.For example, DG-2(10) represent 2 channels and 10 rollers. Increasing one channel every time, the ... represent 2 YZ1515x pump heads connect, and form 2 channels. Increasing one channel every time, the weight increases ...