A connection (100, 200) for connecting adjoining precast wall panels (102, 104, 202), the connection (100, 200) comprising: a connecting bar comprising an external thread at each end portion of the connecting bar; first and second connection bodies (106, 108, 206), each comprising a cavity (110, 112, 210) for receiving at least a portion of the connecting bar and configured to be positioned within a respective precast wall panel (102, 104, 202) such that when the precast wall panels (102, 104, 202) are connected the cavity (110, 210) of the first connection body (106, 206) substantially aligns with the cavity of the second connection body; first and second fasteners (128, 130, 228) configured to engage with the respective external threads of the connecting bar; characterised in that the connection comprises an alignment element for aligning the cavities (110, 112, 210) of the first and second connection bodies (106, 108, 206), the alignment element comprising an alignment channel for receiving the connecting bar; and in that the connection (100, 200) is configured such that when the connecting bar extends through the alignment channel of the alignment element and into the cavities (110, 112, 210) of the first and second connection bodies (106, 108, 206) positioned within the precast wall panels (102, 104, 202), the first and second fasteners (128, 130, 228) can engage with the respective external threads of the connecting bar to apply opposing forces to the connecting bar thereby connecting the adjoining wall panels (102, 104, 202), and a sealed space is formed between the connecting bar and the alignment channel of the alignment element that defines a flow channel between the cavities (110, 112) for receiving a setting material. a connecting bar comprising an external thread at each end portion of the connecting bar; first and second connection bodies (106, 108, 206), each comprising a cavity (110, 112, 210) for receiving at least a portion of the connecting bar and configured to be positioned within a respective precast wall panel (102, 104, 202) such that when the precast wall panels (102, 104, 202) are connected the cavity (110, 210) of the first connection body (106, 206) substantially aligns with the cavity of the second connection body; first and second fasteners (128, 130, 228) configured to engage with the respective external threads of the connecting bar; characterised in that the connection comprises an alignment element for aligning the cavities (110, 112, 210) of the first and second connection bodies (106, 108, 206), the alignment element comprising an alignment channel for receiving the connecting bar; and in that the connection (100, 200) is configured such that when the connecting bar extends through the alignment channel of the alignment element and into the cavities (110, 112, 210) of the first and second connection bodies (106, 108, 206) positioned within the precast wall panels (102, 104, 202), the first and second fasteners (128, 130, 228) can engage with the respective external threads of the connecting bar to apply opposing forces to the connecting bar thereby connecting the adjoining wall panels (102, 104, 202), and a sealed space is formed between the connecting bar and the alignment channel of the alignment element that defines a flow channel between the cavities (110, 112) for receiving a setting material.