I have a leak from a 4 inch cast iron vent pipe in my basement. It appears to have rusted through and it is dripping. It is very smelly. I am not sure what can be done to fix it. I am guessing it is just rain water that has collected in the pipe that is rusting it out. Since it is just a vent is there anyway to add a rain cap and repair it? If it need to be replaced how should I do this and how much should be replaced? The pipe is rusted all the way to the elbow so I am not sure how to attach a new PVC pipe if this is needed. I have included a picture of what it looks like with some notes.
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