Abstract: In one aspect, the invention provides a fastening tee assembly for use on a conduit, the conduit generally having pressurized contents, the assembly comprising a first shell having a port therethrough, a second shell, fastening means to fasten said first and second shells around the conduit, a pressure carrying branch suitable for insertion through the first shell's port and having a sealing end and an inside passage, said inside passage suitable for accepting a drill or hot tap machine therethrough, a seal suitable for creating a sealing engagement between the pressure carrying branch's sealing end and the conduit, and engagement means to maintain the sealing engagement between the pressure carrying branch's sealing end and the conduit. A method aspect is also provided.

Abstract: The invention provides a removable closure system comprising a tubular member having an internal surface with an internal profile therein, an entrance end and a plug end, the internal profile providing a collet shoulder and a plug stopping shoulder. A plug assembly is positioned within the tubular member. The plug assembly has a plug suitable for insertion through the tubular member at the entrance end and past the collet shoulder, a collet with a plurality of collet fingers. The collet fingers are moveable between a collapsed and a normally expanded condition, the collapsed condition suitable for insertion of the plug assembly through the tubular member past the collet shoulder and the expanded condition suitable for engaging the collet shoulder. When the plug assembly is placed in the tubular member against the plug stopping shoulder, and the collet fingers are in the expanded condition engaging the collet shoulder, the plug assembly is removably secured in the tubular member.

Abstract: The invention provides a removable closure system comprising a tubular member having an internal surface with an internal profile therein, an entrance end and a plug end, the internal profile providing a dog shoulder and a plug stopping shoulder. A plug assembly is positioned within the tubular member. The plug assembly has a plug suitable for insertion through the tubular member at the entrance end and past the dog shoulder, a plurality of dogs. The dogs are moveable between a collapsed and an expanded condition, the collapsed condition suitable for insertion of the plug assembly through the tubular member past the dog shoulder and the expanded condition suitable for engaging the dog shoulder. When the plug assembly is placed in the tubular member against the plug stopping shoulder, and the dogs are in the expanded condition engaging the dog shoulder, the plug assembly is removably secured in the tubular member.