means for supplying a mixture of {TAIL ~ water} and detergent to {HEAD ~ said pump}; comprising 
means for supplying a mixture of { TAIL ~ water } and detergent to { HEAD ~ said pump } ; comprising
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH