An inner periphery of the socket is provided with a seal ring for sealing {HEAD ~ an interval} between the inner periphery of the socket and {TAIL ~ an outer periphery} of the plug in an airtight manner and a hold ring for restricting movement of the seal ring in an axial direction 
between
An inner periphery of the socket is provided with a seal ring for sealing { HEAD ~ an interval } between the inner periphery of the socket and { TAIL ~ an outer periphery } of the plug in an airtight manner and a hold ring for restricting movement of the seal ring in an axial direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH TAIL 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