Patent ID: 7644735

Claim:
An insert to be sealingly mounted into a plug hole of a multi-layered pipe, said pipe having a sealing area with an edge surrounding said plug hole, said insert comprising an internal unit and a fastener, said internal unit comprising a sealing portion proximate a first end thereof, a mounting portion proximate a second end thereof, and a recessed region axially spacing apart the sealing portion and the mounting portion, and said fastener being configured and dimensioned to fit over internal unit's second end and having corresponding cooperating sealing portions and mounting portions, said sealing portion of the internal unit being formed with a flange adapted to be forced into said plug hole, said flange and said sealing portion of the fastener having corresponding sealing surfaces adapted to sealingly clamp therebetween said sealing area of said pipe, when the insert is mounted into the plug hole; said internal unit and fastener are designed such that when the fastener is sealingly mounted on the internal unit, a chamber is created between the recessed region of the internal unit and the fastener, the chamber including the recessed region and being in fluid communication with the outside environment, allowing atmospheric pressure within said chamber, and wherein the edge of the plug hole is located in said chamber so that if leaking liquid reaches the edge it will not be pressurized to penetrate between the layers of the pipe.