Patent ID: 7915534

Claim:
A grommet, comprising: a tubular grommet inner member—insertable into an insertion hole formed in an attachment panel, the grommet inner member comprising a plurality of lock portions provided on an outer surface of the grommet inner member and configured to position the grommet inner member at an inner edge of the attachment panel around the insertion hole from a first surface of the attachment panel; and a tubular grommet outer member attached coaxially to an end of the grommet inner member from a second surface of the attachment panel opposite the first surface, the grommet outer member configured to abut the attachment panel to provide sealing between the grommet inner member and the attachment panel, wherein the grommet inner member further comprises at least one of a centering unit and a temporary anchor unit provided on the outer surface of the grommet inner member, the centering unit comprising a plurality of centering portions configured to elastically abut on the attachment panel at the inner edge thereof around the insertion hole so as to position the grommet inner member in a center of the insertion hole when the grommet inner member is inserted into the insertion hole, the temporary anchor unit comprising a plurality of engaging portions configured to engage with the inner edge of the attachment panel around the insertion hole, thereby supporting the grommet inner member in an axial direction thereof before the lock portions position the grommet inner member at the inner edge of the attachment panel around the insertion hole when the grommet inner member is inserted into the insertion hole, the grommet inner member comprises an assembly of two split halves forming split faces extending in an axial direction, and the lock portions, the engaging portions and the centering portions are arranged on any of concentric circles with the same center as that of a semicircular portion of each of the two split halves.