Abstract: Connector for vessels or pipes which includes first and second connection members (20, 60) which are clamped and sealed together. The second connection member (60) is closed by a wall (51) through which a hole (53) is cut after the vessels or pipes have been positioned. An insertion tool (90) is used to engage a clamping bracket (40) with the wall (51) to secure the connection members together when the first connection member (20) is fitted to the hole (53). A resilient sealing ring (30) surrounds the hole (53) and is compressed between the connection members (20, 60).An O-ring seal (70) on the second connection member (60) allows for relative movement between the vessels or pipes.The connector may be installed from inside a vessel or pipe where access is restricted and the connector allows for misalignment between the inlets or outlets of the vessels or pipes.