{HEAD ~ a dispensing head} attachable to a mouth of {TAIL ~ a beverage tank} filled with beverage 
{ HEAD ~ a dispensing head } attachable to a mouth of { TAIL ~ a beverage tank } filled with beverage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH