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Old 07-23-2008, 04:11 PM   #1
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running new PVC drain to existing cast metal


hello, I installed an island with a sink in my kitchen I'm using an AAV for air flow instead of the traditional island loop vent. The PVC drain will go trhough the kitchen floor into the unfinished basement. What can I use to cut the nearest Cast metal horizontal existing drain pipe to connect a PVC Y connection with rubber couplings. I mean does this even sound right? I am a Nurse trying to save some money I'm pretty handy.


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Old 07-24-2008, 12:26 AM   #2
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running new PVC drain to existing cast metal


did you check to see if the AAV is legal in your area?

I personally would never use one even if they were legal. I think they are junk, and don't really WORK according to what code describes as a vent's purpose.

All that aside, cutting cast iron can be tricky, depending on it's condition.

Usually a snap cutter is the easiest and quickest, but if the cast is deteriorated, you could have issues.

A GOOD sawzall and a nice metal blade will get it done (wear safety glasses!) but you have to make sure your cut is nice and square and straight.

After that, you'll need the appropriate fitting, a little pipe, and a couple of no-hub couplings.

Make sure you support that connection well, as well as any horizontal length of PVC, because it will in time end up sagging, and cause clog problems, especially on a kitchen sink. Make sure you have a cleanout on top under the cabinet.

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Old 07-24-2008, 08:36 AM   #3
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running new PVC drain to existing cast metal


Thank you for the input. Sould the Cleanout be at the trap under the cabinet or above or below the sanitary T?
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Old 07-24-2008, 10:08 AM   #4
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running new PVC drain to existing cast metal


Our shop puts them below the trap arm in a 2 x 1-1/2 santee. Since a 2" drain only needs a 1-1/2 cleanout, you could put it in the vent portion as well if you wanted to. Kind of a matter of preference really.
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Old 07-24-2008, 05:41 PM   #5
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If you are using an AAV, and I have installed literally thousands with extremely low failure rates, you can use the AAV connection as a cleanout. You can also use the trap adapter at the p-trap connection as a clean out. Nothing wrong with a separate Clean Out Tee either, just a few more options. In any case the clean out should be above the floor in the cabinet.
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