{TAIL ~ One side wall} of the housing defines an opening through which {HEAD ~ the tubing reel} may be slidably removed 
{ TAIL ~ One side wall } of the housing defines an opening through which { HEAD ~ the tubing reel } may be slidably removed
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH