{TAIL ~ A seal} is installed in the groove on the open end of the cup to seal to the primary face of a tubesheet around {HEAD ~ the tested rib plug} 
{ TAIL ~ A seal } is installed in the groove on the open end of the cup to seal to the primary face of a tubesheet around { HEAD ~ the tested rib plug }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD