You don't, you remove the plastic junk and replace the toxic plasatic with cast iron
You can put up to a 2 inch pipe into a 4 inch. If you are putting 4 inch to 4 inch, either take out a section of the cast and put the PVC in or cut out a section and connect the PVC to the cast with rubber sleeves meant for this. You can use a saddle clamp for the 2 inch. It is a half round piece of PVC with a 2 inch connection in it. It is held on with two U bolts that go around the cast pipe. Put it where you need it and mark the 2 inch hole on the cast. Drill a series of 1/8 inch holes around this circle. when you get them all drilled, you can break out the plug. Try to keep it from falling into the cast pipe. Put the saddle clamp on and connect the PVC pipe as needed. Seal the saddle clamp to the cast pipe with plumbers putty.
Schedule 40 PVC pipe. Legal in all residential and up to 3 story commercial applications.
C x M adapter C x F adapter PVC x F adapter PVC x M adapter or Thread if your really using "pipe" in lieu of "tubing"
You can often find a modern connector such as Sharkbite or Qwest fitting to do this.
What ever the local code says is legal
The best way to connect a cast iron pipe to a PVC pipe using a cast iron to PVC adapter is to first clean and prepare the ends of both pipes, then apply a suitable adhesive or sealant to the adapter and securely attach it to both pipes according to the manufacturer's instructions.
Male to female threaded adapters.
Yes, it is possible. Unfortunatly, if you have a cast iron riser, you will have to chip out the concrete to get low enough to cut the riser to install a Clamp-all and a piece of PVC pipe. This might not be possible if you have a short riser. Then you would have to cut the cast iron behind the 90 degree turn. Either way, it's a pain in the butt. Call a plumber. It will be worth it.
Not exactly, but you can still connect them with proper fittings.
No hub coupling
The advantages of using PVC pipe instead of cast iron pipe for plumbing systems include lower cost, easier installation, resistance to corrosion, and lighter weight.
Only if you have leaks or problems.
As far as I know PVC is illegal in New York and Chicago.
If you are screwing in -- yes -- If not -- you do not use pipe dope
To connect PVC to cast iron pipes, you can use a rubber coupling with stainless steel clamps. Make sure the pipes are clean and dry before attaching the coupling. Tighten the clamps securely to create a watertight seal between the PVC and cast iron pipes.
It will connect to the PVC pipe into the wall which ultimately will connect into the main sewer line outside.
Term used with cast-iron, PVC, CPVC and ABS pipe. Cast-Iron; The plain end of a cast-iron pipe. The spigot is inserted into the bell end of the next pipe to make a water tight joint. PVC, CPVC or ABS; A male end of a fitting the same size as the pipe that is inserted into the slip (hub) end of a fitting.