3.5-inch (?) Cast Iron Drain Pipe

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Old 01-21-11, 07:40 AM
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3.5-inch (?) Cast Iron Drain Pipe

I am remodeling a bathroom in my 1949 slab-on-grade house in Arizona and am moving all the fixtures. The existing sub-slab sewer is cast iron pipe with an inside diameter of approximately 3 5/8 inches and an outside diameter of almost exactly 4 1/4 inches. I have measured it in several locations. It appears to be 3 1/2 inch (nominal) pipe. I need to cut out sections of the cast iron and add fittings for the new fixtures. Does anyone know of a supplier of replacement pipe (preferably PVC or ABS) and hubless connectors?
 
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Old 01-21-11, 11:49 AM
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It may be metric-size pipe (ID of 92 mm and an OD of 108 mm).
 
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Old 01-22-11, 06:41 AM
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Metric in 1949??? I doubt it. We had not been infiltrated with such stuff back then. We were American size standard. Not sure why the difference in size, but you should be able to use a 3" to 4" Fernco fitting with worm gear clamps to join the pipe you have with a new 3" PVC. The fernco will stretch somewhat, but not sure if your installation will allow it or not.
 
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Old 01-22-11, 08:10 AM
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What you need is a no-hub. This is what most codes require. A no-hub has a stop inside that lets you butt it up to the pipe. And for fitting cast iron to pvc you need a no-hub, but its called a mission coupling. Cast and PVC are two different sizes and on the mission coupling one side is larger then the other internally. Not like a bell coupling.



Here is the link look under 4" x ??? 3"x ???. Whatever you want to fit.

Mission Rubber Products.html

Mission Rubber Products.html

Mike NJ
 
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