conduit including but not limited to the methods and apparatuses detailed below those described in the aforementioned pipe bursting patents and other methods including reaming which are well known by those familiar with conduit rehabilitation various pipe bursting techniques may be used to burst almost any pipe including but not limited to those formed of vitrified clay reinforced concrete cast iron ductile iron asbestos cement and steel the advantage of these methods is that a new conduit that has an inner diameter at least as large as the original conduit may be inserted into the tunnel thus in situations where for example a sewer line to a home needs to be replaced because of leaking pipe bursting allows for the insertion of a new conduit which has equal or greater capacity to that of the original conduit for example an 81 u2033 diameter conduit can be replaced with a 12 u2033 diameter conduit this is important in applications where the original conduit is at maximum capacity and the use of a smaller diameter conduit is unacceptable in technologies using inner sleeves or liners which are inserted into existing conduits without pipe bursting it is necessarily the case that the new conduit will have an inner diameter and capacity which is somewhat less than the original conduit because the thickness of the liner material occupies some of the inner diameter of the original conduit 0033 fig1 shows one possible arrangement when a relatively larger diameter conduit 2 such as that which may be suitable for water or sewage is inserted into a tunnel after pipe.