I have a washing machine drain that exits the side of the slab as cast iron. There is a neoprene gasket with a female threaded adapter into the gasket. The gasket is a Ty Seal 2 SV. Does this mean this is 2" CI pipe or a 2" hub? The OD of the CI around the gasket was about 3.5". Honestly the pipe ID looks like 1.5" and I was hoping it was 2" since I need to do some repairs and all new work needs to be 2" from what I've read.
What's interesting is the washer standpipe is 1.5" galvanized leaded into what appears to be 2" CI above the slab. The CI was ~2.3" OD so I figured that was 2".
The female threads at the oustide of the house slab had a 1.5" thread to barb fitting with 1.5" poly pipe.