The plug has a plug body with {TAIL ~ an outer sealing member}, a tower, and {HEAD ~ an inner sealing member} 
The plug has a plug body with { TAIL ~ an outer sealing member } , a tower , and { HEAD ~ an inner sealing member }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD