In addition, {HEAD ~ a manual reset switch} requires {TAIL ~ human intervention} to re activate the reservoir pump once the blockage condition is removed 
requires
In addition , { HEAD ~ a manual reset switch } requires { TAIL ~ human intervention } to re activate the reservoir pump once the blockage condition is removed
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH