{TAIL ~ One way valves} in the bottom of the dipper allow water to pass into {HEAD ~ the dipper} 
{ TAIL ~ One way valves } in the bottom of the dipper allow water to pass into { HEAD ~ the dipper }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD