Patent ID: 7108290

Claim:
A device for reinforcing a penetration in corrugated material, the corrugated material having a first side and a second side and having a plurality of corrugations, the device comprising: a tube having a first end and a second end, and having an outside perimeter, the tube configured to be received within the penetration; a first holder attached to the tube, the first holder having a first contour substantially conforming to the first side of the corrugated material around substantially the entire outside perimeter at the penetration and arranged to engage at least one corrugation on the first side of the corrugated material; and a second holder attached to the tube, the second holder having a second contour substantially conforming to the second side of the corrugated material around substantially the entire outside perimeter at the penetration and arranged to engage at least one corrugation on the second side of the corrugated material.