They have a special cutter which you could probably rent to cut the cast iron pipe with. It would be best to go ahead and buy the tee fitting, and couplers first, that way you will know how much of a section will need to be cut from the pipe. You can keep it all cast, or use a PCV TEE fiting and neoprene couplers/stanless steel cuffs/clamps.
There are rubber adapter couplings sold to adapt PVC to Cast Iron. "Fernco" in one brand sold in the U.S.
The cost to replace a cast iron drain pipe can vary depending on factors such as the length of the pipe, the complexity of the installation, and the location of the pipe. On average, homeowners can expect to pay between 1,500 to 3,000 for a professional to replace a cast iron drain pipe.
Where? What is your question?
Gray cast iron is around 118 grams per cubic inch.
By cutting in a cast iron Wye so the flow enters the sewer line (soil pipe) at a right angle
Iron weighs 0.284 pounds per cubic inch, while cast iron is about 0.25-0.27 pounds per cubic inch, due to how it is made and processed. So pure iron is heavier
Change how? Move the location, you bust out the concrete and move it. Replace or repair the flange that the toilet hooks to. Cut the existing flange off flush with the floor and install a new repair flange. They can be brass or steel. You can use a PVC one that fits in the drain and seal it with a wax ring under it and screw it to the floor. If you are working with cast iron flange and the slots where the bolts are supposed to go is broken out, they make a repair piece for this. It is a 3/4 inch wide by 3-4 inch long crescent shape piece that slides under the flange and the bolt that holds the toilet fits into it. You may have to chip out a little concrete along the edge to get these under the flange.
The items that can be found included in a cast iron cookware set are a 10 1/2 inch round griddle, 5-quart Dutch oven, 10 1/4 inch skillet and 10 1/4 inch iron cover.
You remove the existing tub shoe and related fittings and install a new assembly. In some cases a reciprocating saw will be needed to cut the shoe flange located inside the tub
Both and but normally a master plumber would fix the problem by removing the existing drain lead/copper /cast iron and install a new drain and remove the membrane to the existing slab water proof the slab with either roof cement or flashing cement then install 4 PSF sheet lead over the drain flange/clamping gravel stop collar and you will now have a leak proof job
With a compression mission ring
from the hub to the spigot