Abstract: This invention relates to a construction for fitting to a structural member in particular to a construction for routing a conduit or the like through a structural member where the integrity of the seal made by the structural member must be maintained. The construction having an annular bush (50) for fitting tightly in an aperture (43) defined in a structural member, the annular bush (50) being expandable radially when located in the aperture (43) by the action of a mandrel being passed through a longitudinal passageway defined by the bush whereby to exert a compressive force upon the region of the structural member surrounding the bush (50), wherein the bush (50) has a coupling for sealable attachment of a conduit to the bush (50).