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How many fixture units are connected?Do you have a hoarfrost condition in the area.What does your local code state about vent terminals
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Q: Can you replace a cast 4 iron vent with a 3 PVC vent?
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How do you connect cast iron pipe to PVC?

You don't, you remove the plastic junk and replace the toxic plasatic with cast iron


What type of pipe do you use for vent stack?

Cast Iron extra heavy, Cast Iron service weight, No Hub Cast Iron, Galvanized, Copper Tubing, PVC are the most common BUT plastic should not be exposed to direct sun light thus for the vent terminal CI or other Ferrous materials are desired


Can you replace a cast iron sewage pipe with PVC pipe in New york City?

As far as I know PVC is illegal in New York and Chicago.


What lasts longer cast iron or PVC?

Definitely PVC


Your toilet flange broke how do you replace it?

Depends on the type what means I use to replace it CAST Iron/ BRASS / Antimony / PVC / SCREWED TYPE


How do you repair a leaking drain at a leaded joint if you need to replace approx 3' rusted pipe with PVC?

Answer replacing cast iron with PVCThere is a rubber sleeve available that goes in the cast iron and then the PVC slides into it. Use a rubber outside sleeve with two hose clamps. You can also replace the rusted section with PVC and them "lead" them with the packing and a paste sealant that is made for this.


Can you attach PVC piping to a cast iron toilet drain?

Yes, but PVC creates problems


How do you find a plumbing vent?

If you are referring to your vent stack it will be on the roof, either 2" is smaller services and 4" is main line out of the house in either PVC or cast iron. If you are referring to your vent stack it will be on the roof, either 2" is smaller services and 4" is main line out of the house in either PVC or cast iron. If you are referring to your vent stack it will be on the roof, either 2" is smaller services and 4" is main line out of the house in either PVC or cast iron.


Is cast iron required on all 3 levels of a residential home even if the third floor has no plumbing fixtures?

No PVC is acceptable, you can join the new PVC piping into the existing Cast Iron.


Why were cast iron pipes replaced by PVC pipes?

Pvc pipes are cheaper. They are easier to join. They last longer.


Joining to cast iron soil pipe to PVC?

No hub coupling


Why do you use PVC pipes instead of iron pipes?

These days PVC pipes are faster and easier to fit and in many ways more efficient than cast iron.