An isolator for an aircraft fuel tank, the isolator configured to separate an electrically conductive internal panel of the fuel tank from an electrically conductive pipe that passes through the panel, the isolator comprising: a plurality of first attachment points for attaching the isolator to the panel, a plurality of second attachment points for attaching the isolator to a pipe fitting fixed to the pipe, and an aperture defined by an outer wall and extending from a first side of the isolator to a second side of the isolator, the aperture configured to receive the pipe in use, wherein the outer wall of the aperture extends outwardly from the first side of the isolator to form a tube, wherein the tube is configured to pass through the panel in use, wherein the isolator comprises a non-electrically conductive material, characterised in that the plurality of first attachment points and the plurality of second attachment points are positioned on a flange extending from the outer wall of the aperture, wherein each of the plurality of first attachment points is configured to receive a fastener for fastening the isolator to the panel and each of the plurality of second attachment points is configured to receive a fastener for fastening the isolator to said pipe fitting fixed to the pipe, wherein the first attachment points comprise a counterbore extending from the second side of the isolator to the first side of the isolator, wherein the wider end of the counterbore extends from the second side of the isolator, wherein the second attachment points comprise a counterbore extending from the first side of the isolator to the second side of the isolator, and wherein the wider end of the counterbore extends from the first side of the isolator. a plurality of first attachment points for attaching the isolator to the panel, a plurality of second attachment points for attaching the isolator to a pipe fitting fixed to the pipe, and an aperture defined by an outer wall and extending from a first side of the isolator to a second side of the isolator, the aperture configured to receive the pipe in use, wherein the outer wall of the aperture extends outwardly from the first side of the isolator to form a tube, wherein the tube is configured to pass through the panel in use, wherein the isolator comprises a non-electrically conductive material, characterised in that the plurality of first attachment points and the plurality of second attachment points are positioned on a flange extending from the outer wall of the aperture, wherein each of the plurality of first attachment points is configured to receive a fastener for fastening the isolator to the panel and each of the plurality of second attachment points is configured to receive a fastener for fastening the isolator to said pipe fitting fixed to the pipe, wherein the first attachment points comprise a counterbore extending from the second side of the isolator to the first side of the isolator, wherein the wider end of the counterbore extends from the second side of the isolator, wherein the second attachment points comprise a counterbore extending from the first side of the isolator to the second side of the isolator, and wherein the wider end of the counterbore extends from the first side of the isolator.