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