An inner periphery of the socket is provided with a seal ring for sealing an interval between {HEAD ~ the inner periphery} of {TAIL ~ the socket} and 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 
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An inner periphery of the socket is provided with a seal ring for sealing an interval between { HEAD ~ the inner periphery } of { TAIL ~ the socket } and 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 OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH