{HEAD ~ A liquid drain} withdraws the liquid constituent from {TAIL ~ the vessel} at a rate determined by a level assembly 
{ HEAD ~ A liquid drain } withdraws the liquid constituent from { TAIL ~ the vessel } at a rate determined by a level assembly
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH