Reduced Waste Line?

[Bill Smith]

Does this line reduce in size or is it just the difference in size from cast iron to PVC?

[Jeffrey R. Jonas]

Originally Posted by bsmith

Does this line reduce in size or is it just the difference in size from cast iron to PVC?

There is a reduction, but it is very slight. I wouldn't be concerned with it. Mostly pipe thickness difference.

I would be more concerned with what looks to be an s-trap (on the left).

[Bill Smith]

Thanks Jeffrey - The s trap is on the washer standpipe. Given the amount of non-professional plumbing work in this house, the s trap is the least of their worries LOL

[Robert J. OConnor]

The CI and PVC pipe should have about the same OD if they are the same pipe size. What varies somewhat is the inside diameter ...

CI Soil/Waste Pipe: http://www.engineeringtoolbox.com/ca...ns-d_1751.html
PVC Soil/Waste Pipe: http://www.engineeringtoolbox.com/pv...ons-d_795.html

That appears to be a 4" CI/PVC x 3" CI/PVC fernco coupling which looks like this ...



Have the plumber check that out while he is there ...

[Charley L. Bottger]

Sure appears to me that the CI is 4 inch and the PVC is 3 inch just saying who wants to buy 4 inch PVC its expensive