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Originally Posted by GottaDiesel
The way I understand it is that the P-Trap built into the toilet is only about 2" anyway... so 3" is the "norm" -- All the cast iron in my house going to toilets is 4" as is the main. Go figure. 3" will make it much easier for sending it down walls, I just didn't know...
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cast iron is fairly thick...are you measuring outside diameter or inside diameter? In my case I have all copper down to 3 feet above the basement floor where it becomes cast iron.
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Proud owner of ....
1971 280SE W108
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