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 an outer periphery of the plug in {TAIL ~ an airtight manner} and a hold ring for restricting movement of the seal ring in an axial direction 
in
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 an outer periphery of the plug in { TAIL ~ an airtight manner } and a hold ring for restricting movement of the seal ring in an axial direction
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