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It is a bathrrom sink drain, 1 1/2 " PVC. What is the maximum distance before venting a drain from a sink or shower?

I'm putting in a new sink and tying it in to a drain line about seven and a half feet away. The line that I'm tapping into is vented at that point. Is this venting sufficient for the new sink or do I need to run its own vent line up above the ceiling and tie into the vent in the attic? Thanks...

It is almost impossible to get to the main stack from where I am installing a new bathroom. There is a secondary stack that I can access. Can I vent the toilet to this using a reducer to go from the 3 inch waste pie to a 1 1/2 inch vent pipe? If I can vent it this way, how far up from the toilet...

I'm putting in a new bathroom and need to cut into existing cast iron pipe. It is about 3 inches in diameter and I have about 2 inches to work with behind it. Can I use a scissors type chain cutter for this or do I need the rachet type? Thanks.