Abstract: Method and apparatus for internally sealing live low pressure residential gas supply lines, including gas main tap and associated fittings, by applying sealant to the inside surface of the gas line. Sealing assemblies allow tapping and insertion of tools without gas escape to atmosphere, as well as application of sealant under gas pressure passed through a supply line which has the ability to rotate in order to feed itself through elbows and fittings to the point where sealing is required, as well as achieve uniform spray coverage of the target pipe's inner surface with sealant.

Abstract: An apparatus and method for inserting a new service pipe into an existing high pressure service pipe that contains a leak, without the necessity of excavation or separately shutting off the supply of the high pressure gas upstream of the effected pipe section. A nosecone coupled with a unique stopper assembly allows a temporary sealing of the high pressure pipe between the main and the leak point, and insertion flow of a sealer through the nosecone, such that the sealer fills the annular space between the new pipe and the old pipe, providing a gas tight permanent seal. The end of the stopper assembly has temporary stop plug that must be drilled open to reestablish the communication of high pressure gas into the new pipe without the chance of flow entering the old pipe.