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 . <EOS>