A coupler device is described for joining together two adjacent members 7,17 and in particular structural members which may for example may be tunnel segments, well segments, building segments, precast concrete members, preformed panels and other items used in but not limited to the construction industry. The coupler device has an elongate body 2 carrying spaced apart first and second projecting portions 6,16, wherein each of the first and second projecting portions is configured to be received within a complementarily recessed portion 8,18 in a face of a respective member and thereby in use to join together the two respective members.
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