The breather bag is vertically mounted to {HEAD ~ a top surface} of {TAIL ~ the mounting surface structure} 
of
The breather bag is vertically mounted to { HEAD ~ a top surface } of { TAIL ~ the mounting surface structure }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL