first spring biased, normally closed check valve means in said third conduit means for preventing {TAIL ~ backflow} into {HEAD ~ said water container}, and 
first spring biased , normally closed check valve means in said third conduit means for preventing { TAIL ~ backflow } into { HEAD ~ said water container } , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH