4" is the standard house sewer main
Rusted cast iron.
Water mains. Sewer line.
Concrete and cast Iron pipes are made of cast iron and plastic piping systems normally use plastics
You don't ... You do melt the material inside the hub
Yes, they can be opened for routine sewer and drain and leader cleaning
Lots of penetrating oil and / or carefully heating with a flame.
A rubber Fernco or Clamp All
By cutting in a cast iron Wye so the flow enters the sewer line (soil pipe) at a right angle
Not normally. Usually the cast iron piping ends at the outside of the house. It is more expensive than alternates, and cast iron is used inside. Outside is usually asbestos concrete, clay, or more recently plastic piping.
By replacing the piping using either Cast Iron of one of the non ferrous systems available
galvanized water lines, cast iron drain lines, sometimes lead pipes, terracotta or clay pipes, and in rare cases wooden pipes.
To scour them use a water Jetter as it removed years of build up soap scum and grease deposits and scale.