:? Hi, i need to replace a horizontal external soil pipe which joins to the main soil pipe. Because of sink pipes also joining in I will need to replace a small part of the main stack below the 't' joint. While leaving the top soilstack and most of the bottom soil stack in place how can I join the new soil pipe with push together fittings without disturbing the main stack - ie the pipe will need to be longer and then pushed into the soil fittings. I dont really want to loosen the top half of the soil stack to be able to join it all together!