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