Patent ID: 7640949

Claim:
A plug for sealing an end of a duct, the plug comprising: a sealing member for sealing against an interior surface of the duct; and gripping means comprising one or more teeth for gripping the interior surface of the duct; wherein the plug comprises a pair of opposed camming surfaces arranged for relative axial movement therebetween whereby the relative axial movement results in the one or more teeth of the gripping means being urged radially outwardly into gripping engagement with the interior surface of the duct; wherein said plug further comprises a main body portion in the form of a shaft for insertion into the end of the duct, and a head portion connected to the shaft, wherein the head portion, in use, protrudes from an end of the duct, and wherein the relative axial movement of the pair of opposed camming surfaces is brought about by axial movement of the shaft; and wherein the shaft is provided with a pair of axially spaced apart compression members, each compression member extending radially outwardly from the shaft, wherein one of the compression members is fixed relative to the shaft and the other compression member is slidable with respect to the shaft; wherein the sealing member is mounted about the shaft between the two compression members so that the axial movement of the shaft compresses the sealing member between the two compression members to deform the sealing member into sealing contact with the interior wall of the duct.