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