Control valves are located at the inlet ports to control the supply of chemical concentrates into the manifold, and the concentrates are drawn into {TAIL ~ the manifold} by {HEAD ~ the operation} of a positive displacement pump 
Control valves are located at the inlet ports to control the supply of chemical concentrates into the manifold , and the concentrates are drawn into { TAIL ~ the manifold } by { HEAD ~ the operation } of a positive displacement pump
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH