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How do you tap a 2 inch drain into a existing 4 inch cast iron pipe?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 8y ago
Wiki User
∙ 13y agoThere is a PVC saddle clamp that is held on with two U bolts. Mark the 2 inch hole, drill it out and clamp the saddle clamp on with plumbers putty under it to seal it to the cast iron. <<< Terrible advice
Saddles are against most modern codes as they are prone to failure and do not enter the drainage system at a right angle in the direction of flow and can actually bore a hole though the piping upon discharge
The correct procedure would be measuring a 4" x 2" Wye or long turn TY
sometimes called a combination fitting and use two Mission no hub couplings . If the existing CI is standard weight or NH then any type of No hub coupling with work, If the existing is extra heavy CI then mission makes a great transition coupling XH x NH .
Also plumbers putty has a tendency to dry out and using it as a sealer under any saddle can allow dangerous sewer fumes to enter the structure
When in doubt ASK A Master Plumber or plumbing engineer someone with formal education and knows modern codes
Also before someone even suggests the use of an illegal "Saddle" especially plastic they should at least ask if this is a commerical application as many codes do not allow the use of plastic except for chemical or acid waste systems
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