| CPC F16L 21/02 (2013.01) | 14 Claims |

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1. An adapter, configured to connect a first pipe member to a second pipe member, wherein the adapter comprises:
a pipe joint, having a first accommodating part and a second accommodating part which are disposed at an interval in a first direction, wherein the first accommodating part is configured to connect with the first pipe member, and the second accommodating part is configured to connect with the second pipe member; and
a first sealing ring, disposed between the first accommodating part and the second accommodating part, so that the first pipe member and the second pipe member are able to abut against the first sealing ring from both sides of the first sealing ring in the first direction, the first sealing ring being in threaded connection with the pipe joint.
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