When the flowing oil meets the outlet 132, {HEAD ~ the oil} drops through {TAIL ~ the outlet} 132 
drops through
When the flowing oil meets the outlet 132 , { HEAD ~ the oil } drops through { TAIL ~ the outlet } 132
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH